KR100816914B1 - Control of insects in animals - Google Patents

Abstract

The present invention relates to a method for controlling parasites present in or on an animal comprising administering to the animal a substantially non-vomiting 1-arylpyrazole that is effective against insecticides.

Description

Control of insects in animals {CONTROL OF ARTHROPODS IN ANIMALS}             

The present invention relates to a method for controlling parasites present in an animal, to a composition comprising a compound effective for said control and to compounds effective against parasites.

In general, agronomists and veterinarians aim to have sufficient means to control pests, especially insects, when they try to invade or attack mammals, particularly livestock and / or livestock. The classic method of controlling these pests has been to use local and / or systemic insecticides on or within the lived animals. Generally effective treatments include oral administration of insect growth regulators (eg lufenuron) or pesticidal compounds (eg ivermectin or avermectin), or topical application of the insecticide fipronil. It is advantageous to apply pesticides to animals in oral form to prevent possible contamination of humans or the surrounding environment.

It is an object of the present invention to provide novel insecticides that can be used in livestock.

Another object of the present invention is to provide safer novel insecticides for livestock.

Another object of the present invention is to provide novel insecticides which can be used at lower dosages than existing pesticides for livestock.

These objects are all or partly met by the present invention.

US 5,079,370, EP-A 0,846,686, WO 98/24769 and WO 97/28126 disclose the use of arylpyrazoles as insecticides. However, these references do not address the problem that antiparasitic agents often cause vomiting in animals that are protected or treated from parasites.

The present invention comprises in or on an animal, preferably comprising orally administering to the animal a substantially non-vomiting amount of 1-arylpyrazole of formula (I) or a veterinary acceptable salt thereof, which is effective for parasites: Provides a way to control existing parasites:

Where

중에서 선택된 헤테로사이클릴이고,R ₂₀₁ is cyano; C (O) alkyl; C (S) NH ₂ ; C (NH) OR ₂₀₃ ; C (NH) SR ₂₀₃ ; Alkyl; C (= NOH) NH ₂ ; C (= NNH ₂ ) NH ₂ ; C (O) NH ₂ ; C (O) NHR ₂₀₅ ; C (O) NR ₂₀₅ R ₂₀₆ ; Haloalkyl; Or a group optionally substituted by R ₂₀₃

Heterocyclyl selected from

R ₂₀₂ is S (O) _h R ₂₀₃ ; C ₂ -C ₆ alkenyl; C ₂ -C ₆ haloalkenyl; Cycloalkyl; Halocycloalkyl; Cycloalkyl-alkyl; C ₂ -C ₆ alkynyl; Nitro; Or imidazol-2-yl optionally substituted by alkyl, alkoxy, haloalkyl, halogen, cyano and / or nitro,

R ₂₀₃ is alkyl or haloalkyl,

R ₂₀₄ is -OH, R ₂₀₅ O-, HC (O) O-, R ₂₀₅ C (O) O-, R ₂₀₅ OC (O) O-, NH ₂ C (O) O-, R ₂₀₅ NHC (O ) O-, R ₂₀₅ R ₂₀₆ NC (O)-, R ₂₀₅ S (O) nC (O) O-, R ₂₀₆ SO ₂ O-, aryl-SO ₂ O-, (C ₄ -C ₇ ) -oxa Cycloalkyloxy, R ₂₀₅ R ₂₀₆ NC (NR ₂₀₅ ) -O-, R ₂₀₅ R ₂₀₆ NC (NH) -O-, R ₂₀₅ NH-C (NR ₂₀₅ ) -O-, R ₂₀₅ NH-C (NH) -O-, R ₂₀₅ N = CH-O-, R ₂₀₅ N = C (R ₂₀₆ ) -O-, R ₂₀₅ NH-C (S) -O- or R ₂₀₅ R ₂₀₆ NC (S) -O- ,

R ₂₀₅ is alkyl, haloalkyl, cycloalkyl, halocycloalkyl, alkoxyalkyl, haloalkoxyalkyl, adamantyl, aminoalkyl, alkylaminoalkyl, dialkylaminoalkyl, haloalkylaminoalkyl, di (haloalkyl) aminoalkyl , Optionally substituted aryl, optionally substituted hetaryl, optionally substituted arylalkyl, optionally substituted hetarylalkyl, C ₂ -C ₆ alkenyl or C ₂ -C ₆ alkynyl,

R ₂₀₆ is alkyl, haloalkyl, cycloalkyl, halocycloalkyl, alkoxyalkyl, haloalkoxyalkyl, optionally substituted aryl, optionally substituted hetaryl, optionally substituted arylalkyl, optionally substituted hetarylalkyl ,

Or R ₂₀₅ and R ₂₀₆ together with the nitrogen atom to which they are attached may form a 3 to 7 membered ring which may further contain one or more heteroatoms selected from nitrogen, oxygen and sulfur,

X ₁ is selected from nitrogen and CR ₂₁₂ ,

R ₂₁₁ and R ₂₁₂ are independently selected from halogen, hydrogen, CN, C ₁ -C ₃ alkyl and NO ₂ ,

R ₂₁₃ is selected from halogen, haloalkyl, haloalkoxy, -S (O) _k CF ₃ and -SF ₅ or taken together with R ₂₁₄ to form a ring,

R ₂₁₄ is hydrogen or together with R ₂₁₃ forms an OCF ₂ O, CF ₂ OCF ₂ , CF ₂ OCF ₂ O and CF ₂ CF ₂ O group to form a 5-6 membered ring with the carbon to which they are attached Can,

h, k and n are independently selected from 0, 1 and 2.

The term "veterinarily acceptable salt" means salts whose anions are known and acceptable in the art for the formation of salts for veterinary use. Suitable acid addition salts produced, for example, by compounds of formula (I) containing basic nitrogen atoms (eg amino groups) are salts with inorganic acids, for example hydrochlorides, sulfates, phosphates and nitrates, and acetic acid Salts with organic acids.

When R ₂₀₄ is OH, the pyrazole structure may also be represented in its tautomeric form as a pyrazolone structure.

Unless stated otherwise, alkyl and alkoxy groups are straight-chain or branched and are generally lower alkyl and alkoxy groups having 1 to 6 carbon atoms, preferably 1 to 4 carbon atoms. Generally, haloalkyl, haloalkoxy and haloalkylamino groups have 1 to 4 carbon atoms. Halogen means F, Cl, Br and I, preferably F and Cl. Haloalkyl, haloalkoxy and haloalkylamino groups may contain one or more halogen atoms. Preferred groups of this type include -CF ₃ and -OCF ₃ . Cycloalkyl groups generally have 3 to 6, preferably 3 to 5 carbon atoms and may be substituted by one or more halogen atoms. Preferably in the compounds of the formula (I), the alkyl group is generally substituted by 1 to 5 halogen atoms, preferably 1 to 3 halogen atoms. Chlorine and fluorine atoms are preferred.

In the compound of formula (I), an example of cycloalkylalkyl is cyclopropylmethyl, an example of cycloalkoxy is cyclopropyloxy and an example of alkoxyalkyl is CH ₃ OCH _2- .

In general, in dialkylamino or di (haloalkyl) amino radicals, the alkyl and haloalkyl groups on nitrogen may be selected independently of one another.

In general, the term "aryl" preferably means a carbocyclic aromatic radical having 6 to 14, in particular 6 to 12, carbon atoms, for example phenyl, naphthyl or biphenylyl, preferably phenyl The term "heterocyclyl" preferably means a hetaryl or heteroaliphatic ring system, wherein the term "hetaryl" preferably means that at least one CH group is substituted by N and / or at least two adjacent CH Group means an aryl radical substituted by S, NH or O, for example thiophene, furan, pyrrole, thiazole, oxazole, imidazole, isothiazole, isoxazole, pyrazole, 1,3, 4-oxadiazole, 1,3,4-thiadiazole, 1,3,4-triazole, 1,2,4-oxadiazole, 1,2,4-thiadiazole, 1,2,4 -Triazole, 1,2,3-triazole, 1,2,3,4-tetazole, benzo [b] thiophene, benzo [b] furan, indole, benzo [c] thiophene, benzo [c] Furan, isoindole, benzo Oxazole, Benzothiazole, Benzimidazole, Benzisoxazole, Benzisothiazole, Benzopyrazole, Benzothiadiazole, Benzotriazole, Dibenzofuran, Dibenzothiophene, Carbazole, Pyridine, Pyrazine, Pyridine Midine, pyridazine, 1,3,5-triazine, 1,2,4-triazine, 1,2,4,5-triazine, quinoline, isoquinoline, quinoxaline, quinazoline, cinnoline, 1, 8-naphthyridine, 1,5-naphthyridine, 1,6-naphthyridine, 1,7-naphthyridine, phthalazine, pyridopyrimidine, purine, pteridine or 4H-quinolizine, and "hetero Aliphatic ring system "preferably means a (C ₃ -C ₈ ) cycloalkyl radical wherein at least one carbon unit is substituted by an O, S or NR 'group and R' is hydrogen, (C ₁ -C ₄ ) Alkyl, (C ₁ -C ₄ ) alkanoyl, (C ₁ -C ₄ ) alkoxycarbonyl, (C ₁ -C ₄ ) alkylsulfonyl, (C ₁ -C ₄ ) alkoxy or aryl.

Substituents that can provide various aliphatic, cycloaliphatic, aromatic and heterocyclic ring systems include, for example, halogen, nitro, cyano, di- (C ₁ -C ₄ ) alkylamino, (C ₁ -C ₄ ) Alkyl, (C ₃ -C ₈ ) cycloalkyl, (C ₁ -C ₄ ) trialkylsilyl, (C ₁ -C ₄ ) alkoxy, (C ₁ -C ₄ ) alkoxy- (C ₁ -C ₄ ) alkyl, (C ₁ -C ₂ ) alkoxy- [CH ₂ CH ₂ O] _0,1,2 -ethoxy, (C ₁ -C ₄ ) alkylthio, (C ₁ -C ₄ ) alkylsulfinyl, (C _1- C ₄ ) alkylsulfonyl, phenyl, benzyl, phenoxy, halophenoxy, (C ₁ -C ₄ ) alkylphenoxy, (C ₁ -C ₄ ) alkoxyphenoxy, phenylthio, heterocyclyl, heterocyclyl Thio or heterocyclyloxy, wherein one or more (up to the maximum number in the case of fluorine) hydrogen atoms in the alkyl radicals and radicals derived therefrom may be substituted by halogen, preferably chlorine or fluorine, wherein these If the substituents are (C ₁ -C ₄ ) alkyl they may be linked in a cyclic form. Where one or two aliphatic carbon units in a conjugated system such as, for example, indane, di-, tetra- or decahydronaphthyl or benzocycloheptane may be replaced by a hetero atom such as oxygen or sulfur One or more (up to the maximum number in the case of fluorine) hydrogen atoms on aliphatic carbon atom units may be substituted by halogen or (C ₁ -C ₄ ) alkyl.

The invention also includes enantiomeric and diastereomeric forms of the compounds of formula (I) and salts thereof.

The term nonvomiting means a compound that generally does not induce vomiting from an animal when a protective, prophylactic or clean dose is administered to the animal. The term vomiting means vomiting. In general, the vomiting substance causes the vomiting within 24 hours after administration, preferably within 8 hours, more preferably within 2 hours. Generally, when administering a compound of the invention to an animal population, at least 70%, preferably at least 80% and most preferably at least 90% of the animals do not vomit.

Preferred compounds of formula I are

R ₂₀₁ is cyano, C (O) alkyl, C (S) NH ₂ , alkyl, C (= NOH) NH ₂ or C (= NNH ₂ ) NH ₂ ,

R ₂₀₂ is S (O) _h R ₂₀₃ , C ₂ -C ₃ alkenyl, C ₂ -C ₃ haloalkenyl, cycloalkyl, halocycloalkyl, cycloalkyl-alkyl or C ₂ -C ₃ alkynyl,

R ₂₀₃ is alkyl or haloalkyl,

R ₂₀₄ is -OH, R ₂₀₅ O-, HC (O) O-, R ₂₀₅ C (O) O-, R ₂₀₅ OC (O) O-, NH ₂ C (O) O-, R ₂₀₅ NHC (O ) O-, R ₂₀₅ R ₂₀₆ NC (O) O- or R ₂₀₅ S (O) nC (O) O-,

R ₂₀₅ is alkyl, haloalkyl, cycloalkyl, halocycloalkyl, alkoxyalkyl, haloalkoxyalkyl, aminoalkyl, alkylaminoalkyl, dialkylaminoalkyl, haloalkylaminoalkyl or di (haloalkyl) aminoalkyl,

R ₂₀₆ is alkyl, haloalkyl, cycloalkyl, halocycloalkyl, alkoxyalkyl or haloalkoxyalkyl, or

Or R ₂₀₅ and R ₂₀₆ together with the nitrogen to which they are attached may form a 3 to 7 membered ring which may further contain one or more heteroatoms selected from nitrogen, oxygen and sulfur,

X ₁ is selected from nitrogen and CR ₂₁₂ ,

R ₂₁₁ and R ₂₁₂ are independently selected from halogen, hydrogen, CN and NO ₂ ,

R ₂₁₃ is selected from halogen, haloalkyl, haloalkoxy, -S (O) _k CF ₃ and -SF ₅ ,

R ₂₁₄ is hydrogen,

h, k and n are independently selected from 0, 1 and 2.

Preferred further compounds of formula I according to the invention

R ₂₀₁ is cyano,

R ₂₀₂ is S (O) _h R ₂₀₃ ,

R ₂₀₃ is alkyl or haloalkyl,

R ₂₀₄ is OH or R ₂₀₅ O,

X ₁ is selected from nitrogen and CR ₂₁₂ ,

R ₂₁₁ and R ₂₁₂ are independently selected from halogen, hydrogen, CN and NO ₂ ,

R ₂₁₃ is selected from halogen, haloalkyl, haloalkoxy, -S (O) _k CF ₃ and -SF ₅ ,

h and k are compounds independently selected from 0, 1 and 2.

Compounds of formula (I) of the invention preferably have one or more of the following features:

R ₂₀₁ is cyano, R ₂₀₃ is halomethyl, preferably CF ₃ , R ₂₁₁ and R ₂₁₂ are independently halogen, X ₁ is CR ₂₁₂ , R ₂₁₃ is haloalkyl, haloalkoxy or —SF ₅ And h is 0, 1 or 2.

A further aspect of the present invention is provided that R ₂₀₄ is not R ₂₀₅ O or R ₂₀₅ R ₂₀₆ NC (O) -O-, wherein R ₂₀₁ is CN and R ₂₀₂ is S (O) _h R ₂₀₃ , Compound.

In another aspect of the invention, a method is provided for controlling parasites present in or on an animal by administering to the animal 1-arylpyrazole of Formula II or a veterinary acceptable salt thereof:

Where                 

R ₂₁ is cyano, C (= S) NH ₂ , C (= NOH) NH ₂ or C (= NNH ₂ ) NH ₂ ,

R ₂₂ is S (O) _m R ₂₃ ,

R ₂₃ is alkyl or haloalkyl,

R ₂₄ is OH, HC (O) O-, R ₂₅ C (O) O-, R ₂₅ OC (O) O-, R ₂₅ R ₂₅ -NC (O) -O- or R ₂₅ S (O) _n C (O) O-,

R ₂₅ is alkyl, haloalkyl, cycloalkyl, halocycloalkyl, alkoxyalkyl, haloalkoxyalkyl, adamantyl, aminoalkyl, alkylaminoalkyl, dialkylaminoalkyl, haloalkylaminoalkyl, di (haloalkyl) aminoalkyl , Optionally substituted aryl, optionally substituted hetaryl, optionally substituted arylalkyl, optionally substituted hetarylalkyl, C ₂ -C ₆ alkenyl or C ₂ -C ₆ alkynyl,

Or two R ₂₅ groups together with the nitrogen to which they are attached may form a 3 to 7 membered ring which may further contain one or more heteroatoms selected from nitrogen, oxygen and sulfur,

X is selected from nitrogen and CR ₃₂ ,

R ₃₁ and R ₃₂ are independently selected from halogen, hydrogen, CN, C ₁ -C ₃ alkyl and NO ₂ ,

R ₃₃ is selected from halogen, haloalkyl, haloalkoxy, —S (O) _r CF ₃ , and —SF ₅ or forms a ring with R ₃₄ ,

R ₃₄ is hydrogen or together with R ₂₁₃ forms an OCF ₂ O, CF ₂ OCF ₂ , CF ₂ OCF ₂ O and CF ₂ CF ₂ O group to form a 5-6 membered ring together with the carbon to which they are attached; Can,

m is 0, 1 or 2,

r is selected from 0, 1 and 2,

Provided that when R ₂₁ is cyano R ₂₄ is not R ₂₅ R ₂₅ -NC (O) -O-.

Preferred compounds of formula II are

R ₂₁ is cyano, C (= S) NH ₂ , C (= NOH) NH ₂ or C (= NNH ₂ ) NH ₂ ,

R ₂₂ is S (O) _m R ₂₃ ,

R ₂₃ is alkyl or haloalkyl,

R ₂₄ is OH, HC (O) O—, R ₂₅ C (O) O—, R ₂₅ OC (O) O— or R ₂₅ S (O) _n C (O) O—,

R ₂₅ is alkyl, haloalkyl, cycloalkyl, halocycloalkyl, alkoxyalkyl or haloalkoxyalkyl,

X is selected from nitrogen and CR ₃₂ ,

R ₃₁ and R ₃₂ are independently selected from halogen, hydrogen, CN, C ₁ -C ₃ alkyl and NO ₂ ,

R ₃₃ is a compound selected from halogen, haloalkyl, haloalkoxy, —S (O) _r CF ₃ and —SF ₅ .

In another embodiment of the invention, as described above, except that 1- (2,6-dichloro-4-trifluoromethylphenyl) -3-cyano-4-trifluoromethylthio-5-hydroxy Compounds of formula II or salts thereof are provided that are not pyrazoles.

Further preferred classes of compounds of formula II are

R ₂₁ is cyano,

R ₂₂ is S (O) _m R ₂₃ ,

R ₂₃ is haloalkyl, preferably CF ₃ ,

R ₂₄ is OH,

X is selected from nitrogen and CR ₃₂ ,

R ₃₁ and R ₃₂ are independently selected from halogen,

R ₃₃ is selected from halogen, haloalkyl, haloalkoxy, —S (O) _r CF ₃ and —SF ₅ ,

m and r are independently selected from 0, 1 and 2,

Provided that the compound is not 1- (2,6-dichloro-4-trifluoromethylphenyl) -3-cyano-4-trifluoromethylthio-5-hydroxypyrazole.

In a further aspect of the invention there is provided the following group of compounds:

중에서 선택된 헤테로사이클릴인 화학식 Ⅰ의 화합물. R ₂₀₁ is C (O) NH ₂ ; C (O) NHR ₂₀₅ ; C (O) NR ₂₀₅ R ₂₀₆ ; C (O) N = S (R ₂₀₃ ) ₂ ; Haloalkyl; Or a group optionally substituted by R ₂₀₃

A compound of formula (I) which is heterocyclyl selected from.

R ₂₀₂ is nitro; Or imidazol-2-yl optionally substituted by alkyl, alkoxy, haloalkyl, halogen, cyano or nitro.

R ₂₀₄ is R ₂₀₆ SO ₂ O-, aryl _{-SO 2 O-, (C 4 -C} 7) - oxazol _{cycloalkyloxy, R 205 R 206 NC (NR} 205) -O-, R 205 R 206 NC (NH ) -O-, R ₂₀₅ NH-C (NR ₂₀₅ ) -O-, R ₂₀₅ NH-C (NH) -O-, R ₂₀₅ N = CH-O-, R ₂₀₅ N = C (R ₂₀₆ ) -O -R ₂₀₅ NH-C (S) -O- or R ₂₀₅ R ₂₀₆ NC (S) -O-.

A compound of formula (I) in which R ₂₁₄ together with R ₂₁₃ form OCF ₂ O, CF ₂ OCF ₂ , CF ₂ OCF ₂ O and CF ₂ CF ₂ O groups to form a 5-6 membered ring together with the carbon to which they are attached; .

 Compound 1- (2,6-dichloro-4-trifluoromethylphenyl) -3-cyano-4-trifluoromethylsulfinyl-5-hydroxypyrazole and 1- (2,6-dichloro-4- Trifluoromethylphenyl) -3-cyano-4-trifluoromethylsulfonyl-5-hydroxypyrazole is a very preferred compound according to the present invention.

 The compounds of the formula (I) listed in Tables 1 to 3 are preferred compounds according to the invention. Compound numbers are for identification purposes only. The following symbols are defined as follows: Me means methyl, Et means ethyl, n-Pr means n-propyl, i-Pr means isopropyl, n-Bu is n -Butyl, and Ph means phenyl.                 

Synthesis method

Method 1

Compounds of Formula I and Formula II wherein R ₂₀₄ / R ₂₄ = OH and R ₂₂ = SR ₂₃ can be synthesized by reacting 5-hydroxypyrazole with sulfenylchloride with or without base in an organic solvent ( For example, see EP-A-295 117):

Method 2

Compounds of formula (I) and formula (II) wherein R ₂₀₄ / R ₂₄ = OH and R ₂₂ = SR ₂₃ can be synthesized by reacting 5-hydroxypyrazole with disulfidedichloride. The resulting pyrazoledisulfides can be alkylated to yield 4-pyrazolesulfides (see, eg, EP-A-374 061, EP295117, C. Wakselman, J. Chem. Soc. Perkin Trans 1, 1992 3371). -3375]):

Method 3

Compounds of formula (I) and formula (II) wherein R ₂₀₄ / R ₂₄ = OH and R ₂₂ = S (O) _a R ₂₃ (a = 1, 2) include pyrazolesulfide (R ₂₂ = SR ₂₃ ) and peroxide compounds ( Organic peroxides such as acetic acid peroxide), halogen derivatives (such as periodate salts) and the like to react to obtain sulfoxides (R ₂₂ = SOR ₂₃ ) and sulfones (R ₂₂ = SO ₂ R ₂₃ ). (See eg EP-A-295 117).

In another embodiment of the invention, R ₂₄ is HC (O) O—, R ₂₅ C (O) O—, R ₂₅ OC (O) O— or R ₂₅ S (O) _n C (O) O and R ₂₁ Compounds of formula II wherein R ₂₂ , R ₃₁ , R ₃₃ , X and n are as defined above wherein R ₂₄ is OH and R ₂₁ , R ₂₂ , R ₃₁ , R ₃₃ , X and n are defined above It is generally prepared by reacting a compound of formula (II) as described above with each compound of formula (III), (IV), (V) and (VI) wherein X ₂ is a leaving group such as a halogen atom or an acetyl group.

HC (O) X ₂

R ₂₅ C (O) X ₂

R ₂₅ OC (O) X ₂

R ₂₅ S (O) _n C (O) X ₂

Compounds of formula (II) wherein R ₂₄ is OH and R ₂₁ , R ₂₂ , R ₃₁ , R ₃₃ , X and n are defined above are generally employed by methods known in the art, or by International Patent Publication WO 94/21606, WO 97/07102, WO 98/24767, WO 98/28277, WO 98/28278 and WO 98/28279, European Patent Application No. 385809, and US Patent It may be prepared by the methods described in 5232940 and 5047550 or other methods known to those skilled in the art.

The present invention also relates to a composition comprising a substantially non-vomiting amount of a compound of formula (I) or a salt thereof and an acceptable carrier, which is effective against pesticides. Acceptable carriers for the use of the compounds are generally known to the skilled person in connection with pest control present in animals, in particular livestock, most preferably dogs or cats.

Compositions that can be used in the present invention may generally comprise from about 0.001 to 95% of a compound of formula (I) or a salt thereof. The remaining portion of the composition up to 100% generally comprises a carrier as well as various additives. In the specification and the appended claims, percentages are by weight.

Diluted liquid formulations generally comprise from about 0.001 to about 3%, preferably from about 0.1 to about 0.5% of the compound of formula (I) or a salt thereof. Solid formulations generally comprise from about 0.1 to about 8%, preferably from about 0.5 to about 1.5% of the compound of formula (I) or salt thereof.

Compositions for oral administration include one or more compounds of formula (I) or salts thereof with a veterinary acceptable carrier or coating, and include, for example, tablets, pills, capsules, gels, potions, prescribed feeds, prescribed drinking water, Prescribed dietary supplements, large sustained release pills or other sustained release devices intended to remain in the gastrointestinal tract. All of these may include active ingredients contained in microcapsules or coated with acid labile or alkali labile or other pharmaceutically acceptable enteric coatings. Feed premixes or concentrates containing a compound of the present invention for use in the preparation of prescribed meals, drinking water or other materials for consumption by animals may also be used. In a very preferred embodiment, the composition is administered after a meal, preferably immediately after a meal and within 2 hours after a meal. In a very preferred embodiment, a product is provided that is easily chewed by an animal, which generally does not defile a human when presented to the animal by hand. The compounds of formula (I) or salts thereof may be administered before meals, during meals or after meals. The compound of formula (I) or salt thereof may be mixed with the carrier and / or food.

According to the invention, the compounds of formula (I) or salts thereof are generally from 0.1 to 500 mg / kg, preferably from 1 to 100 mg / kg, more preferably from 1 to 50 mg / kg, even more preferably from 2 to The animals are administered orally to a dosage range of 25 mg / kg, most preferably 3 to 15 mg / kg.

According to the present invention, the frequency of treatment of animals, preferably livestock, treated with a compound of formula (I) or a salt thereof is generally from about once a week to about once a year, preferably about two weeks. Once every six months, more preferably once every two weeks to once every three months, most preferably once every two weeks to once every six weeks.

In general, the animal to be treated is a domestic animal, preferably a domestic pet. More preferably the animals to be treated are dogs and / or cats.

Thus, in a preferred embodiment, a method is provided for controlling a parasite present in or on a cat, comprising orally administering to the cat a substantially non-vomiting amount of 1-arylpyrazole of Formula I, which is effective for the parasite. .

In a further preferred embodiment, a method is provided for controlling a parasite in or on a dog, comprising orally administering to the dog a non-vomiting amount of 1-arylpyrazole of Formula I, which is effective for the parasite.

The invention also relates to a composition comprising an effective amount of a compound of formula (II) or a salt thereof and an acceptable carrier for a parasite. Acceptable carriers for the use of these compounds are generally known to those skilled in the art for pest control in animals, especially livestock, most preferably dogs or cats.

In another embodiment of the invention, the compound of formula (II) or a salt thereof is used in the field of veterinary or animal husbandry or in vertebrates, in particular warm-blooded vertebrates, for example livestock (e.g. calf, sheep, goat, horse, wild boar, poultry, dog or Cats) can be used to maintain public health for insects, worms, or protozoa that internally or externally parasite in cats.

The compound may be used for parenteral, oral or topical administration of a composition to an animal invaded or exposed to an insect, worm or protozoa, wherein the active ingredient exhibits immediate and / or extended action over the insect, worm or protozoa. Appropriate pharmaceutical formulations, edible feeds, salt licks, dietary supplements, pouring formulations, sprays, baths, dips, showers, jets, applied by, for example, feed or orally By dust, grease, shampoo, cream, wax smear or incorporation into a livestock self-healing system.

Solid or liquid compositions for topical application in animals, wood, storage products or furnish are generally from about 0.00005 to about 90% by weight, in particular from about 0.001 to about 10% by weight of at least one compound of formula II or veterinary acceptable Contains possible salts. When a solid or liquid composition is administered to an animal orally or parenterally, including transdermally, they usually contain about 0.1 to about 90% by weight of one or more compounds of formula (II) or veterinary acceptable salts thereof.

The prescribed livestock feed usually contains about 0.001 to 3% by weight of one or more compounds of formula (II) or veterinary acceptable salts thereof. Concentrates or supplements for mixing with livestock feed usually contain from about 5 to about 90 weight percent, preferably from about 5 to 50 weight percent of one or more compounds of formula (II) or veterinary acceptable salts thereof. Mineral salts usually contain from about 0.1 to about 10% by weight of one or more compounds of formula (II) or veterinary acceptable salts thereof.

Dust or liquid compositions for application in the livestock, commodity, premises or outdoor sector contain from about 0.0001 to about 15% by weight, in particular from about 0.005 to about 2.0% by weight of at least one compound of formula II or a veterinary acceptable salt thereof can do. Suitable concentrations of at least one compound of formula (II) or a veterinary acceptable salt thereof in the water to be treated are about 0.0001 to about 20 ppm, in particular about 0.001 to about 5.0 ppm, and can be used for treatment at a suitable number of exposures in fish breeding. The dietary feed may contain from about 0.01 to about 5 weight percent, preferably from about 0.01 to about 1.0 weight percent of one or more compounds of formula (II) or veterinary acceptable salts thereof.

When administered to a vertebrate parenterally, orally or percutaneously, or by other methods, the dosage of a compound of Formula II or a veterinary acceptable salt thereof is determined by the species, age or health of the vertebrate, and by insects, worms or It will depend on the extent and nature of the actual or potential invasion by protozoal pests. For a continuous regimen, one dose of about 0.1 to about 500 mg / kg, preferably about 0.1 to about 100 mg / kg, preferably about 2.0 to about 20.0 mg / kg, or about 0.01 to A dose of about 20.0 mg / kg, preferably about 0.1 to about 5.0 mg / kg is generally suitable for oral or parenteral administration. By the use of sustained release formulations or devices, the required daily dosage over several months may be combined and administered to the animal at one time.

The compounds of the present invention may be most advantageously administered with other substances effective for parasites, such as endoparasiticides and / or ectoparasiticides and / or endectoparasiticides. For example, such compounds include macrocyclic lactones, avermectin or millvemycin (eg ivermectin); Pyratel (generally administered as pyrantel pamoate); Or insect growth regulators (eg, lufenuron or methoprene).

As used herein and in the claims, the term "insecticide" refers to both internal and external repellents, in particular external repellents, in warm-blooded animals. Preferably fleas and / or ticks are rescued by the method according to the invention.

Examples of specific parasites of various host animals that can be controlled by the present invention include the following insects:

Mite: Mesostigmata species, for example mesostigmatides such as chicken mite, Dermayssus gallinae; Itch or scab mites, such as Sarcoptidae species, for example Sarcoptes scabiei; Mange mites such as Psoroptidae species, including Chorioptes bovis and Psoroptes ovis; Larvae, for example Trombiculidae species, for example North American larvae, Trombicula alfreddugesi;

Tick: soft-body ticks, including Argasidae species, such as, for example, Argas species and Ornithodoros species; Hard-body ticks, including Ixodidae species, such as the species Rhipicephalus sanguineus and Boophilus;

Lice: blood-sucking teeth, for example Menopon species and Bovicola species; Radishes include, for example, Haematopinus species, Linognathus species and Solenopotes species;

Fleas: Tennocephalides species such as dog fleas (Ctenocephalides canis) and cat fleas (Ctenocephalides felis); Xenopsylla species, such as the oriental rat flea (Xenopsylla cheopis); And Pulex species such as human fleas (Pulex irritans);

True bugs; Simicidae, including common bed ticks (Cimex lectularius); Triatominae species, including triatomid mites, also known as kissing mites; Rhodnius prolixus and Triatoma species;

Blood-sucking adult flies: for example, horn flies [Haematobia irritans], horse flies [Tabanus spp.], Stable flies [Stomoxys calcitrans], black Flies [Simulium spp.], Deer flies [Chrysops spp.], These flies [Melophagus ovinus], cheche flies [Glossina spp.] Mosquitoes [Culax (Culex) species, Anopheles species, and Aedes species; And

Parasitic fly maggots: for example horsefly larvae (Oestrus ovis and Cuterebra spp.), Blow flies [Phaenicia spp.], Black fly larvae [Coccilio] Cochliomyia hominivorax], calf larvae (Hypoderma spp.), Fleeceworm.

The present invention also preferably provides the use of a compound of formula (I) or a salt thereof as a therapeutic agent for an animal, more preferably a livestock.

Veterinary compositions may be sterile or non-sterile. It may be a liquid (eg water soluble) or solid (eg dry) composition, especially a lyophilized composition, and an orally effective solution may be prepared by the addition of water or other liquids.

The invention also provides the use of a compound of formula (I) or a salt thereof as defined above for preparing a veterinary composition for the control of parasites in or on an animal.

In a further aspect of the invention there is provided the use of a compound of formula (I) or a salt thereof for controlling parasites present in or on an animal without causing vomiting of the animal.

Preference is given to the use for oral administration of the compound, preferably to livestock, very preferably cats or individual animals.

In a further aspect of the invention there is provided the use of a compound of formula (I) or a salt thereof for the preparation of a substantially non-vomiting composition for the control of parasites in or on an animal, preferably for oral administration. .

The invention also relates to a method for cleaning an animal in good health, comprising applying to the animal a compound of formula (I) or a salt thereof as defined above.

The method of cleaning the animal is not a treatment method by the treatment of the animal body itself. Because (a) the animal is in good health and does not require substantial treatment to eliminate the deficiency of health, (b) the cleaning of the animal is not done by a veterinarian, but by a person interested in washing the animal. And (c) the purpose of such cleaning is to avoid unpleasant conditions so that humans are not infected with insects transmitted by animals for humans and the environment in which they live.

"Carrier" means an organic or inorganic material that can be natural or synthetic and that is combined with a compound to facilitate administration of the compound to an animal. Thus, the carrier should generally be inert and entomologically acceptable. The carrier may be solid (eg, clays, silicates, silica, resins, waxes) or liquids (eg, water, alcohols, ketones, oil solvents, polar aprotic solvents). An example of an oil solvent is soybean oil. An example of a polar protic solvent is dimethyl sulfoxide.

The compounds of the invention also have utility in the control of insect or nematode pests of plants. The active compound is generally applied at a rate of about 0.005 to about 25 kg, preferably 0.02 to 2 kg of active compound per hectare to the portion to control insect or nematode invasion. Under ideal conditions, lower rates may provide adequate protection depending on the pest being killed. On the other hand, due to adverse weather conditions, pest resistance and other factors, it may be necessary for the active ingredient to be used at a higher rate.

If the pest is soil infectious, the formulation containing the active compound is evenly distributed in the area to be treated in any convenient way. The application can be done as required, in the field or crop cultivation area as a whole or in the immediate vicinity of the seed or plant to be protected from attack. The active ingredient may be washed into the soil by spraying with water over the area or left to allow for the natural action of rain. During or after application, the formulation can be distributed mechanically, for example by tilling or disking, to the soil as desired.

Application can be done before planting, when planting, after planting but before sprouting or after sprouting.

The compounds of the present invention mainly attack the soil to control nematodes that live in the soil, but also attack the parasites of plants (e.g., Aphelenchoides species and ditylenchus species). It can be applied as a solid or liquid composition, mainly to the leaves to relieve it.

The compounds of the present invention are valuable for controlling pests by eating part of the plant far from the point of application. Leaf-eating insects, for example, are killed by the compounds of the present invention applied to the roots. In addition, the present compounds can reduce the attack of plants by taste repellent or insect repellent effects.

The compounds of the present invention may be used in fields, feed, farms, glass houses, orchards and vineyard crops, or ornamental plants and forest trees, such as cereals (eg corn, wheat, rice, sorghum), cotton, tobacco Leaves, vegetables and salads (e.g. legumes, flat crops, curcurbit, lettuce, onions, tomatoes and peppers), field crops (e.g. potatoes, sugar beets, peanuts, beans, oil seed rape) ), Sugar cane, grassland crops and feed (e.g. corn, sorghum, lucerne), farm crops (e.g. tea, coffee, cocoa, bananas, oil palm, coconut, rubber, spice), Orchard crops (eg, nucleus, rhizome, citrus, kiwi, avocado, mango, olive and walnut), vineyard crops, ornamental plants, under glass and in flowers and shrubs in gardens and parks, in forests, farms and seedlings Of particular value in the protection of forest trees (deciduous and evergreen) The.

Compounds of the invention may also be used for leaf bees (e.g., Eurocerus) or beetles (e.g., scoletides, platipodides, lacticed, bostrichesd, cerambide, annoids), or termites, For example, there is value in protection of forests (standing, falling, modified, stored or structural) from attacks by reticulitermes species, heterotermes species, and captoterms species. have.

The compounds of the present invention also apply to the protection of stored produce such as whole grains, fruits, nuts, spices, and tobacco leaves. It also protects stored animal products, such as natural or modified forms of leather, hair, fur and feathers (for example as carpets or textiles) from moth and beetle attacks, and also protects stored meat and fish from beetles, ticks and flies. Protect against attacks

The disclosure of US Provisional Application No. 60/168658, which is the basis of the claims of priority herein, is incorporated herein by reference.

Example 1

Preparation of 1- (2,6-dichloro-4-trifluoromethylphenyl) -3-cyano-4-trifluoromethylsulfinyl-5-hydroxypyrazole

15 g (35.5 mmol) of 1- (2,6-dichloro-4-trifluoromethylphenyl) -3-cyano-4-trifluoromethylsulphenyl-5-hydroxy in 125 ml of dichloromethane at room temperature To a solution of pyrazole was added a solution of m-chloroperbenzoic acid (8.76 g, 70%, 35.5 mmol) in 375 ml of dichloromethane. The resulting solution was stirred for 17 hours at room temperature. The solution was then concentrated and triturated with ethyl acetate and heptane (1: 2). Filtration gave a solid. The solid was dissolved in ethyl acetate and stirred with saturated sodium hydrogen carbonate solution. Each layer was separated and the aqueous layer was extracted three times with ethyl acetate. The combined organic layers were dried (magnesium sulfate) and concentrated. Chromatographic purification via silica gel column yielded a solid (5.7 g, 13.01 mol, 37%) as the desired product. m.p. 185-187 ° C. (decomposition).

Example 2

Preparation of 1- (2,6-dichloro-4-trifluoromethylphenyl) -3-cyano-4-trifluoromethylsulfonyl-5-hydroxypyrazole

2 g (4.74 mmol) of 1- (2,6-dichloro-4-trifluoromethylphenyl) -3-cyano-4-trifluoromethylsulphenyl-5-hydroxypyra in 1,2-dichloroethane To the solution of the sol was added 1.83 ml (9.52 mmol, 35% in acetic acid) at room temperature. The resulting solution was heated to 60 ° C. for 9 hours. The solution was then cooled and concentrated to give 2.05 g residue. Chromatographic purification via a silica gel column eluting with a gradient solvent mixture (heptane / ethyl acetate) gave an oil (1.08 g, 2.38 mmol, yield 50.2%) with 98% HPLC purity as the desired product; F-NMR, -60.999 ppm (ArCF ₃ ), -79.893 ppm (SO ₂ CF ₃ ), H-NMR, 8.18 ppm (s, 2H).

Example 3

Preparation of 1- (2,6-dichloro-4-trifluoromethylphenyl) -3-amino-4-trifluoromethylsulphenyl-5-hydroxypyrazole

1- (2,6-dichloro-4-trifluoromethylphenyl) -3-cyano-4-trifluoromethylsulphenyl-5-hydroxypyrazole (3.0 g, 7.13 mmol) and concentrated sulfuric acid (3 ml) was heated at 100 ° C. for 3 hours. The reaction mixture was cooled down and poured into ice water. The solids were collected by filtration and washed with water. The solution was then vacuum dried to yield 98% solids (2.88 g, 6.56 mmol, 92% yield) with HPLC purity. m.p. 197-198 ° C.

Example 4

Preparation of 1- (2,6-dichloro-4-trifluoromethylphenyl) -3-thioamido-4-trifluoromethylsulphenyl-5-hydroxypyrazole

1- (2,6-dichloro-4-trifluoromethylphenyl) -3-amido-4-trifluoromethylsulphenyl-5-hydroxypyrazole (1 g, 2.28 mmol) and Loweson in toluene ) A mixture of reagents (0.49 g, 1.21 mmol) was heated to reflux for 4 hours. The reaction mixture turned into solution during reflux. The solution was then cooled, concentrated and subjected to chromatography purification to give a solid (0.283 g, 0.623 mmol, yield 27.3%) with a HPLC purity of 96%. m.p. 150-151 ° C. (decomposition).

Example 5

Preparation of 1- (2,6-dichloro-4-trifluoromethylphenyl) -3-oxymikamido-4-trifluoromethylsulphenyl-5-hydroxypyrazole

1- (2,6-dichloro-4-trifluoromethylphenyl) -3-cyano-4-trifluoromethylsulphenyl-5-hydroxypyrazole (3.0 g, 7.11 mmol in 15 ml of methanol at room temperature To the solution of hydroxyamine hydrochloride (0.59 g, 8.53 mmol) and triethylamine (0.94 g, 9.24 mmol) were added. The resulting mixture was stirred with additional hydroxyamine hydrochloride (1.18 g, 17.06 mmol) and triethylamine (1.88 g, 18.5 mmol) added in portions at room temperature for a total of 48 hours. The resulting reaction mixture was concentrated and then dissolved in ethyl acetate. The organic layer was washed with saturated ammonium chloride, water, dried (sodium sulfate) and concentrated to give a brown oil which solidified after standing. m.p. 184 ° C.

Example 6

Preparation of 1- (2,6-dichloro-4-trifluoromethylphenyl) -3-cyano-4-trifluoromethylsulphenyl-5-trimethylacetoxypyrazole

1- (2,6-dichloro-4-trifluoromethylphenyl) -3-cyano-4-trifluoromethylsulphenyl-5-hydroxypyrazole in 1,2-dichloroethane (7.00 g, 16.6 mmol) and pyridine (4.91 g, 62.1 mmol) were added dropwise to trimethylacetyl chloride (4.37 g, 36.2 mmol). An ice bath was used to maintain the reaction temperature. After 20 hours at room temperature the organic layer was washed five times with aqueous KHSO ₄ until the aqueous solution reached pH 1. The organic layer was then dried (MgSO ₄ ) and concentrated to give a solid residue. The solid residue was triturated with pentane and chromatographed purification via a silica gel column yielded a white solid (2.403 g, yield 28.6%, HPLC purity 97.0%) as the desired product. mp 82-83 ° C.

Example 7

Preparation of 1- (2,6-dichloro-4-trifluoromethylphenyl) -3-cyano-4-chlorodifluoromethylsulphenyl-5-hydroxypyrazole

1- (2,6-dichloro-4-trifluoromethylphenyl) -3-cyano-4-chlorodifluoromethylsulphenyl-5-hydroxypyrazole in dichloromethane at -50 to -60 deg. 12.0 g, 37.3 mmol) and pyridine (3.25 g, 41.0 mmol) were added chlorodifluoromethanesulphenyl chloride (8.1 g, 46.6 mmol). The resulting solution was gradually warmed up to room temperature. After 20 hours the organic layer was washed five times with water. The solution was then washed with brine and dried (Na ₂ SO ₄ ) to give an oil. Chromatographic purification separated a total of 11.6 g (26.4 mmol, yield 71%) of oil with HPLC purity 97% as the desired product. F-NMR; -30.05 ppm (CClF ₂ ), -63.80 ppm (ArCF ₃ ).

Biological Example

Compound 1- (2,6-dichloro-4-trifluoromethylphenyl) -3-cyano-4-trifluoromethylthio-5-hydroxypyrazole, 1- (2,6-dichloro-4-tri Fluoromethylphenyl) -3-cyano-4-trifluoromethylsulfinyl-5-hydroxypyrazole and 1- (2,6-dichloro-4-trifluoromethylphenyl) -3-cyano-4- Trifluoromethylsulfonyl-5-hydroxypyrazole is prepared as a 30 mg / mL formulation in a solution of 1: 1 volume / volume of dimethyl sulfoxide and corn oil.

This formulation is used to treat mixed breeding dogs and cats at a rate of 10 mg / kg for dogs and 20 mg / kg for cats. Animals are fed half of the daily feed just prior to treatment without feeding for at least 8 hours prior to treatment and the remainder of the daily feed immediately after treatment.

All dogs are infected with cat teeth (Tenocephalides felis) and ticks (Lipcephalus sangineus) one day before administration of the compound. Cats only infect with this. Initial tooth and tick numbers are counted one day after administration of the compound. Dogs are reinfected with ticks at 7, 14, 21 and 28 days after treatment and dogs and cats are reinfected with them at 8, 15, 22 and 29 days after treatment. On treated dogs and cats, on 1, 9, 16, 23 and 30 days after treatment, for a group of infected dogs and cats that received a placebo consisting of a solution of 1: 1 volume / volume of dimethyl sulfoxide and corn oil Measure the relief of teeth and ticks. In order to measure the efficiency of these compounds, insects are carefully found and counted in animals. Any serious adverse event for a period of 8 to 30 days in many of the above-mentioned compounds in the evaluation of any of the three areas (its relief in the dog, relief of the ticks in the dog, and relief in the cat). Satisfactory results are obtained without. The compound is as follows: 1- (2,6-dichloro-4-trifluoromethylphenyl) -3-cyano-4-trifluoromethylsulphenyl-5-trimethylacetoxypyrazole 3-10, 1 -(2,6-dichloro-4-trifluoromethylphenyl) -3-cyano-4-trifluoromethylsulphenyl-5-ethoxypyrazole 3-1, 1- (2,6-dichloro-4 -Trifluoromethylphenyl) -3-cyano-4-chlorodifluoromethylsulphenyl-5-hydroxypyrazole 1-9, 1- (2,6-dichloro-4-trifluoromethylphenyl) -3 -Cyano-4-trifluoromethylsulphenyl-5-hydroxypyrazole 1-1, 1- (2,6-dichloro-4-trifluoromethylphenyl) -3-cyano-4-trifluoro Methylsulfonyl-5-hydroxypyrazole 1-5, 1- (2,6-dichloro-4-trifluoromethylphenyl) -3-cyano-4-trifluoromethylsulfinyl-5-hydroxypyra Sol 1-3, 1- (2,6-dichloro-4-trifluoromethylphenyl) -3-cyano-4-trifluoromethylsulfonyl-5-N, N-dimethylcarbamyloxypyrazole 19- One.

Claims (23)

delete delete A compound of formula II or a veterinary acceptable salt thereof: Formula II

Where R ₂₁ is cyano, C (= S) NH ₂ , C (= NOH) NH ₂ or C (= NNH ₂ ) NH ₂ ; R ₂₂ is S (O) _m R ₂₃ ; R ₂₃ is C ₁ -C ₆ alkyl or C ₁ -C ₆ haloalkyl; R ₂₄ is OH, HC (O) O-, R ₂₅ C (O) O-, R ₂₅ OC (O) O-, R ₂₅ R ₂₅ -NC (O) -O- or R ₂₅ S (O) _n C (O) O—; R ₂₅ is C ₁ -C ₆ alkyl, C ₁ -C ₆ haloalkyl, C ₃ -C ₆ cycloalkyl, C ₃ -C ₆ halocycloalkyl, C ₁ -C ₆ alkoxy C ₁ -C ₆ alkyl, C ₁ -C ₆ haloalkoxy C ₁ -C ₆ alkyl, adamantyl, C ₁ -C ₆ aminoalkyl, C ₁ -C ₆ alkylamino C ₁ -C ₆ alkyl, C ₁ -C ₆ dialkylamino C ₁ -C ₆ alkyl, C ₁ -C ₆ haloalkylamino C ₁ -C ₆ alkyl, di (C ₁ -C ₆ haloalkyl) amino C ₁ -C ₆ alkyl, Unsubstituted or substituted phenyl, naphthyl or biphenylyl, Substituted phenyl, naphthyl or biphenylyl, wherein at least one CH group is substituted by N and at least two adjacent CH groups are substituted by S, NH or O, Unsubstituted or substituted phenyl C ₁ -C ₆ alkyl, naphthyl C ₁ -C ₆ alkyl or biphenylyl C ₁ -C ₆ alkyl, Substituted phenyl C ₁ -C ₆ alkyl, naphthyl C ₁ -C ₆ alkyl, or biphenylyl C ₁ -C ₆ alkyl, wherein at least one CH group is substituted by N, and at least two adjacent CH groups are S, Substituted by NH or O), C ₂ -C ₆ alkenyl or C ₂ -C ₆ alkynyl, or Or two R ₂₅ groups together with the nitrogen to which they are attached may form a 3 to 7 membered ring which may further contain one or more heteroatoms selected from nitrogen, oxygen and sulfur; X is CR ₃₂ ; R ₃₁ and R ₃₂ are independently selected from the group consisting of halogen, hydrogen, CN, C ₁ -C ₃ alkyl and NO ₂ ; R ₃₃ is selected from the group consisting of halogen, C ₁ -C ₆ haloalkyl, C ₁ -C ₆ haloalkoxy, —S (O) _r CF ₃ and -SF ₅ ; R ₃₄ is hydrogen; r is selected from the group consisting of 0, 1 and 2; n is selected from the group consisting of 0, 1 and 2; M is selected from the group consisting of 1 and 2 when R ₂₁ is cyano and m is selected from the group consisting of 0, 1 and 2 when R ₂₁ is not cyano; The term "substituted" as used for R ₂₅ is halogen, nitro, cyano, di- (C ₁ -C ₄ ) alkylamino, (C ₁ -C ₄ ) alkyl, (C ₃ -C ₈ ) cyclo Alkyl, (C ₁ -C ₄ ) trialkylsilyl, (C ₁ -C ₄ ) alkoxy, (C ₁ -C ₄ ) alkoxy- (C ₁ -C ₄ ) alkyl, (C ₁ -C ₂ ) alkoxy- [ CH ₂ CH ₂ O] _0,1,2 -ethoxy, (C ₁ -C ₄ ) alkylthio, (C ₁ -C ₄ ) alkylsulfinyl, (C ₁ -C ₄ ) alkylsulfonyl, phenyl, benzyl , Phenoxy, halophenoxy, (C ₁ -C ₄ ) alkylphenoxy, (C ₁ -C ₄ ) alkoxyphenoxy, phenylthio, Phenyl, naphthyl or biphenylyl, wherein at least one CH group is substituted by N and at least two adjacent CH groups are substituted by S, NH or O, (C ₃ -C ₈ ) cycloalkyl, wherein one or more carbon units are substituted by O, S or NR ′ groups, and R ′ is hydrogen, (C ₁ -C ₄ ) alkyl, (C ₁ -C ₄ ) Alkanoyl, (C ₁ -C ₄ ) alkoxycarbonyl, (C ₁ -C ₄ ) alkylsulfonyl, (C ₁ -C ₄ ) alkoxy, phenyl, naphthyl or biphenylyl), Phenylthio, naphthylthio or biphenylylthio, wherein at least one CH group is substituted by N and at least two adjacent CH groups are substituted by S, NH or O, (C ₃ -C ₈ ) cycloalkylthio wherein at least one carbon unit is substituted by an O, S or NR ′ group, R ′ is hydrogen, (C ₁ -C ₄ ) alkyl, (C ₁ -C ₄ ) Alkanoyl, (C ₁ -C ₄ ) alkoxycarbonyl, (C ₁ -C ₄ ) alkylsulfonyl, (C ₁ -C ₄ ) alkoxy, phenyl, naphthyl or biphenylyl), Phenyloxy, naphthyloxy or biphenylyloxy, wherein at least one CH group is substituted by N and at least two adjacent CH groups are substituted by S, NH or O, or (C ₃ -C ₈ ) cycloalkyloxy, wherein at least one carbon unit is substituted by an O, S or NR ′ group, and R ′ is hydrogen, (C ₁ -C ₄ ) alkyl, (C ₁ -C ₄ ) Alkanoyl, (C ₁ -C ₄ ) alkoxycarbonyl, (C ₁ -C ₄ ) alkylsulfonyl, (C ₁ -C ₄ ) alkoxy, phenyl, naphthyl or biphenylyl) ; Provided that when R ₂₁ is cyano R ₂₄ is not R ₂₅ R ₂₅ -NC (O) -O-. The method of claim 3, wherein R ₂₁ is cyano, R ₂₃ is C ₁ -C ₆ haloalkyl, R ₂₄ is OH, R ₃₁ and R ₃₂ are independently selected from halogen, m is selected from the group consisting of 1 and 2 Of compounds. The method of claim 4, wherein The compound of formula (II) which is 1- (2,6-dichloro-4-trifluoromethylphenyl) -3-cyano-4-trifluoromethylsulfinyl-5-hydroxypyrazole. The method of claim 4, wherein The compound of formula (II) which is 1- (2,6-dichloro-4-trifluoromethylphenyl) -3-cyano-4-trifluoromethylsulfonyl-5-hydroxypyrazole. delete delete delete delete A compound of formula II or a veterinary acceptable salt thereof: Formula II

Where R ₂₁ is cyano, C (= S) NH ₂ , C (= NOH) NH ₂ or C (= NNH ₂ ) NH ₂ ; R ₂₂ is S (O) _m R ₂₃ ; R ₂₃ is C ₁ -C ₆ alkyl or C ₁ -C ₆ haloalkyl; R ₂₄ is -OH, HC (O) O-, R ₂₅ C (O) O-, R ₂₅ OC (O) O-, R ₂₅ R ₂₅ NC (O) -O- or R ₂₅ S (O) _n C (O) O—; R ₂₅ is C ₁ -C ₆ alkyl, C ₁ -C ₆ haloalkyl, C ₃ -C ₆ cycloalkyl, C ₃ -C ₆ halocycloalkyl, C ₁ -C ₆ alkoxy C ₁ -C ₆ alkyl, C ₁ -C ₆ haloalkoxy C ₁ -C ₆ alkyl, adamantyl, C ₁ -C ₆ aminoalkyl, C ₁ -C ₆ alkylamino C ₁ -C ₆ alkyl, C ₁ -C ₆ dialkylamino C ₁ -C ₆ alkyl, C ₁ -C ₆ haloalkylamino C ₁ -C ₆ alkyl, di (C ₁ -C ₆ haloalkyl) amino C ₁ -C ₆ alkyl, Unsubstituted or substituted phenyl, naphthyl or biphenylyl, Substituted phenyl, naphthyl or biphenylyl, wherein at least one CH group is substituted by N and at least two adjacent CH groups are substituted by S, NH or O, Unsubstituted or substituted phenyl C ₁ -C ₆ alkyl, naphthyl C ₁ -C ₆ alkyl or biphenylyl C ₁ -C ₆ alkyl, Substituted phenyl C ₁ -C ₆ alkyl, naphthyl C ₁ -C ₆ alkyl, or biphenylyl C ₁ -C ₆ alkyl, wherein at least one CH group is substituted by N, and at least two adjacent CH groups are S, Substituted by NH or O), C ₂ -C ₆ alkenyl or C ₂ -C ₆ alkynyl, or Or two R ₂₅ groups together with the nitrogen to which they are attached may form a 3 to 7 membered ring which may further contain one or more heteroatoms selected from nitrogen, oxygen and sulfur; X is CR ₃₂ ; R ₃₁ and R ₃₂ are independently selected from the group consisting of halogen, hydrogen, CN, C ₁ -C ₃ alkyl and NO ₂ ; R ₃₃ is selected from the group consisting of halogen, C ₁ -C ₆ haloalkyl, C ₁ -C ₆ haloalkoxy, —S (O) _r CF ₃ and -SF ₅ ; R ₃₄ is hydrogen; m is selected from the group consisting of 1 and 2; r is selected from the group consisting of 0, 1 and 2; n is selected from the group consisting of 0, 1 and 2; The term "substituted" as used for R ₂₅ is halogen, nitro, cyano, di- (C ₁ -C ₄ ) alkylamino, (C ₁ -C ₄ ) alkyl, (C ₃ -C ₈ ) cyclo Alkyl, (C ₁ -C ₄ ) trialkylsilyl, (C ₁ -C ₄ ) alkoxy, (C ₁ -C ₄ ) alkoxy- (C ₁ -C ₄ ) alkyl, (C ₁ -C ₂ ) alkoxy- [ CH ₂ CH ₂ O] _0,1,2 -ethoxy, (C ₁ -C ₄ ) alkylthio, (C ₁ -C ₄ ) alkylsulfinyl, (C ₁ -C ₄ ) alkylsulfonyl, phenyl, benzyl , Phenoxy, halophenoxy, (C ₁ -C ₄ ) alkylphenoxy, (C ₁ -C ₄ ) alkoxyphenoxy, phenylthio, Phenyl, naphthyl or biphenylyl, wherein at least one CH group is substituted by N and at least two adjacent CH groups are substituted by S, NH or O, (C ₃ -C ₈ ) cycloalkyl, wherein one or more carbon units are substituted by O, S or NR ′ groups, and R ′ is hydrogen, (C ₁ -C ₄ ) alkyl, (C ₁ -C ₄ ) Alkanoyl, (C ₁ -C ₄ ) alkoxycarbonyl, (C ₁ -C ₄ ) alkylsulfonyl, (C ₁ -C ₄ ) alkoxy, phenyl, naphthyl or biphenylyl), Phenylthio, naphthylthio or biphenylylthio, wherein at least one CH group is substituted by N and at least two adjacent CH groups are substituted by S, NH or O, (C ₃ -C ₈ ) cycloalkylthio wherein at least one carbon unit is substituted by an O, S or NR ′ group, R ′ is hydrogen, (C ₁ -C ₄ ) alkyl, (C ₁ -C ₄ ) Alkanoyl, (C ₁ -C ₄ ) alkoxycarbonyl, (C ₁ -C ₄ ) alkylsulfonyl, (C ₁ -C ₄ ) alkoxy, phenyl, naphthyl or biphenylyl), Phenyloxy, naphthyloxy or biphenylyloxy, wherein at least one CH group is substituted by N and at least two adjacent CH groups are substituted by S, NH or O, or (C ₃ -C ₈ ) cycloalkyloxy, wherein at least one carbon unit is substituted by an O, S or NR ′ group, and R ′ is hydrogen, (C ₁ -C ₄ ) alkyl, (C ₁ -C ₄ ) Alkanoyl, (C ₁ -C ₄ ) alkoxycarbonyl, (C ₁ -C ₄ ) alkylsulfonyl, (C ₁ -C ₄ ) alkoxy, phenyl, naphthyl or biphenylyl) ; Provided that when R ₂₁ is cyano R ₂₄ is not R ₂₅ R ₂₅ -NC (O) -O-. delete The method of claim 4, wherein A compound of formula II wherein R ₂₃ is CF ₃ . A compound of formula II or a veterinary acceptable salt thereof: Formula II

Where R ₂₁ is cyano; R ₂₂ is S (O) _m R ₂₃ ; R ₂₃ is C ₁ -C ₆ alkyl or C ₁ -C ₆ haloalkyl; R ₂₄ is OH, HC (O) O—, R ₂₅ C (O) O—, R ₂₅ OC (O) O— or R ₂₅ S (O) _n C (O) O—; R ₂₅ is C ₁ -C ₆ alkyl, C ₁ -C ₆ haloalkyl, C ₃ -C ₆ cycloalkyl, C ₃ -C ₆ halocycloalkyl, C ₁ -C ₆ alkoxy C ₁ -C ₆ alkyl, C ₁ -C ₆ haloalkoxy C ₁ -C ₆ alkyl, adamantyl, C ₁ -C ₆ aminoalkyl, C ₁ -C ₆ alkylamino C ₁ -C ₆ alkyl, C ₁ -C ₆ dialkylamino C ₁ -C ₆ alkyl, C ₁ -C ₆ haloalkylamino C ₁ -C ₆ alkyl, di (C ₁ -C ₆ haloalkyl) amino C ₁ -C ₆ alkyl, Unsubstituted or substituted phenyl, naphthyl or biphenylyl, Substituted phenyl, naphthyl or biphenylyl, wherein at least one CH group is substituted by N and at least two adjacent CH groups are substituted by S, NH or O, Unsubstituted or substituted phenyl C ₁ -C ₆ alkyl, naphthyl C ₁ -C ₆ alkyl or biphenylyl C ₁ -C ₆ alkyl, Substituted phenyl C ₁ -C ₆ alkyl, naphthyl C ₁ -C ₆ alkyl, or biphenylyl C ₁ -C ₆ alkyl, wherein at least one CH group is substituted by N, and at least two adjacent CH groups are S, Substituted by NH or O), C ₂ -C ₆ alkenyl or C ₂ -C ₆ alkynyl, or Or two R ₂₅ groups together with the nitrogen to which they are attached may form a 3 to 7 membered ring which may further contain one or more heteroatoms selected from nitrogen, oxygen and sulfur; X is CR ₃₂ ; R ₃₁ and R ₃₂ are independently selected from the group consisting of halogen, hydrogen, CN, C ₁ -C ₃ alkyl and NO ₂ ; R ₃₃ is selected from the group consisting of halogen, C ₁ -C ₆ haloalkyl, C ₁ -C ₆ haloalkoxy, —S (O) _r CF ₃ and -SF ₅ ; R ₃₄ is hydrogen; m is selected from the group consisting of 1 and 2; r is selected from the group consisting of 0, 1 and 2; n is selected from the group consisting of 0, 1 and 2; The term "substituted" as used for R ₂₅ is halogen, nitro, cyano, di- (C ₁ -C ₄ ) alkylamino, (C ₁ -C ₄ ) alkyl, (C ₃ -C ₈ ) cyclo Alkyl, (C ₁ -C ₄ ) trialkylsilyl, (C ₁ -C ₄ ) alkoxy, (C ₁ -C ₄ ) alkoxy- (C ₁ -C ₄ ) alkyl, (C ₁ -C ₂ ) alkoxy- [ CH ₂ CH ₂ O] _0,1,2 -ethoxy, (C ₁ -C ₄ ) alkylthio, (C ₁ -C ₄ ) alkylsulfinyl, (C ₁ -C ₄ ) alkylsulfonyl, phenyl, benzyl , Phenoxy, halophenoxy, (C ₁ -C ₄ ) alkylphenoxy, (C ₁ -C ₄ ) alkoxyphenoxy, phenylthio, Phenyl, naphthyl or biphenylyl, wherein at least one CH group is substituted by N and at least two adjacent CH groups are substituted by S, NH or O, (C ₃ -C ₈ ) cycloalkyl, wherein one or more carbon units are substituted by O, S or NR ′ groups, and R ′ is hydrogen, (C ₁ -C ₄ ) alkyl, (C ₁ -C ₄ ) Alkanoyl, (C ₁ -C ₄ ) alkoxycarbonyl, (C ₁ -C ₄ ) alkylsulfonyl, (C ₁ -C ₄ ) alkoxy, phenyl, naphthyl or biphenylyl), Phenylthio, naphthylthio or biphenylylthio, wherein at least one CH group is substituted by N and at least two adjacent CH groups are substituted by S, NH or O, (C ₃ -C ₈ ) cycloalkylthio wherein at least one carbon unit is substituted by an O, S or NR ′ group, R ′ is hydrogen, (C ₁ -C ₄ ) alkyl, (C ₁ -C ₄ ) Alkanoyl, (C ₁ -C ₄ ) alkoxycarbonyl, (C ₁ -C ₄ ) alkylsulfonyl, (C ₁ -C ₄ ) alkoxy, phenyl, naphthyl or biphenylyl), Phenyloxy, naphthyloxy or biphenylyloxy, wherein at least one CH group is substituted by N and at least two adjacent CH groups are substituted by S, NH or O, or (C ₃ -C ₈ ) cycloalkyloxy, wherein at least one carbon unit is substituted by an O, S or NR ′ group, and R ′ is hydrogen, (C ₁ -C ₄ ) alkyl, (C ₁ -C ₄ ) Alkanoyl, (C ₁ -C ₄ ) alkoxycarbonyl, (C ₁ -C ₄ ) alkylsulfonyl, (C ₁ -C ₄ ) alkoxy, phenyl, naphthyl or biphenylyl). . A compound of formula II or a veterinary acceptable salt thereof: Formula II

Where R ₂₁ is C (= S) NH ₂ , C (= NOH) NH ₂ or C (= NNH ₂ ) NH ₂ ; R ₂₂ is S (O) _m R ₂₃ ; R ₂₃ is C ₁ -C ₆ alkyl or C ₁ -C ₆ haloalkyl; R ₂₄ is OH, HC (O) O-, R ₂₅ C (O) O-, R ₂₅ OC (O) O-, R ₂₅ R ₂₅ -NC (O) -O- or R ₂₅ S (O) _n C (O) O—; R ₂₅ is C ₁ -C ₆ alkyl, C ₁ -C ₆ haloalkyl, C ₃ -C ₆ cycloalkyl, C ₃ -C ₆ halocycloalkyl, C ₁ -C ₆ alkoxy C ₁ -C ₆ alkyl, C ₁ -C ₆ haloalkoxy C ₁ -C ₆ alkyl, adamantyl, C ₁ -C ₆ aminoalkyl, C ₁ -C ₆ alkylamino C ₁ -C ₆ alkyl, C ₁ -C ₆ dialkylamino C ₁ -C ₆ alkyl, C ₁ -C ₆ haloalkylamino C ₁ -C ₆ alkyl, di (C ₁ -C ₆ haloalkyl) amino C ₁ -C ₆ alkyl, Unsubstituted or substituted phenyl, naphthyl or biphenylyl, Substituted phenyl, naphthyl or biphenylyl, wherein at least one CH group is substituted by N and at least two adjacent CH groups are substituted by S, NH or O, Unsubstituted or substituted phenyl C ₁ -C ₆ alkyl, naphthyl C ₁ -C ₆ alkyl or biphenylyl C ₁ -C ₆ alkyl, Substituted phenyl C ₁ -C ₆ alkyl, naphthyl C ₁ -C ₆ alkyl, or biphenylyl C ₁ -C ₆ alkyl, wherein at least one CH group is substituted by N, and at least two adjacent CH groups are S, Substituted by NH or O), C ₂ -C ₆ alkenyl or C ₂ -C ₆ alkynyl, or Or two R ₂₅ groups together with the nitrogen to which they are attached may form a 3 to 7 membered ring which may further contain one or more heteroatoms selected from nitrogen, oxygen and sulfur; X is CR ₃₂ ; R ₃₁ and R ₃₂ are independently selected from the group consisting of halogen, hydrogen, CN, C ₁ -C ₃ alkyl and NO ₂ ; R ₃₃ is selected from the group consisting of halogen, C ₁ -C ₆ haloalkyl, C ₁ -C ₆ haloalkoxy, —S (O) _r CF ₃ and -SF ₅ ; R ₃₄ is hydrogen; m is selected from the group consisting of 0, 1 and 2; r is selected from the group consisting of 0, 1 and 2; n is selected from the group consisting of 0, 1 and 2; The term "substituted" as used for R ₂₅ is halogen, nitro, cyano, di- (C ₁ -C ₄ ) alkylamino, (C ₁ -C ₄ ) alkyl, (C ₃ -C ₈ ) cyclo Alkyl, (C ₁ -C ₄ ) trialkylsilyl, (C ₁ -C ₄ ) alkoxy, (C ₁ -C ₄ ) alkoxy- (C ₁ -C ₄ ) alkyl, (C ₁ -C ₂ ) alkoxy- [ CH ₂ CH ₂ O] _0,1,2 -ethoxy, (C ₁ -C ₄ ) alkylthio, (C ₁ -C ₄ ) alkylsulfinyl, (C ₁ -C ₄ ) alkylsulfonyl, phenyl, benzyl , Phenoxy, halophenoxy, (C ₁ -C ₄ ) alkylphenoxy, (C ₁ -C ₄ ) alkoxyphenoxy, phenylthio, Phenyl, naphthyl or biphenylyl, wherein at least one CH group is substituted by N and at least two adjacent CH groups are substituted by S, NH or O, (C ₃ -C ₈ ) cycloalkyl, wherein one or more carbon units are substituted by O, S or NR ′ groups, and R ′ is hydrogen, (C ₁ -C ₄ ) alkyl, (C ₁ -C ₄ ) Alkanoyl, (C ₁ -C ₄ ) alkoxycarbonyl, (C ₁ -C ₄ ) alkylsulfonyl, (C ₁ -C ₄ ) alkoxy, phenyl, naphthyl or biphenylyl), Phenylthio, naphthylthio or biphenylylthio, wherein at least one CH group is substituted by N and at least two adjacent CH groups are substituted by S, NH or O, (C ₃ -C ₈ ) cycloalkylthio wherein at least one carbon unit is substituted by an O, S or NR ′ group, R ′ is hydrogen, (C ₁ -C ₄ ) alkyl, (C ₁ -C ₄ ) Alkanoyl, (C ₁ -C ₄ ) alkoxycarbonyl, (C ₁ -C ₄ ) alkylsulfonyl, (C ₁ -C ₄ ) alkoxy, phenyl, naphthyl or biphenylyl), Phenyloxy, naphthyloxy or biphenylyloxy, wherein at least one CH group is substituted by N and at least two adjacent CH groups are substituted by S, NH or O, or (C ₃ -C ₈ ) cycloalkyloxy, wherein at least one carbon unit is substituted by an O, S or NR ′ group, and R ′ is hydrogen, (C ₁ -C ₄ ) alkyl, (C ₁ -C ₄ ) Alkanoyl, (C ₁ -C ₄ ) alkoxycarbonyl, (C ₁ -C ₄ ) alkylsulfonyl, (C ₁ -C ₄ ) alkoxy, phenyl, naphthyl or biphenylyl). . A compound of formula II or a veterinary acceptable salt thereof: Formula II

Where R ₂₁ is cyano, C (= S) NH ₂ , C (= NOH) NH ₂ or C (= NNH ₂ ) NH ₂ ; R ₂₂ is S (O) _m R ₂₃ ; R ₂₃ is C ₁ -C ₆ alkyl or C ₁ -C ₆ haloalkyl; R ₂₄ is OH, HC (O) O-, R ₂₅ C (O) O-, R ₂₅ OC (O) O-, R ₂₅ R ₂₅ -NC (O) -O- or R ₂₅ S (O) _n C (O) O—; R ₂₅ is C ₁ -C ₆ alkyl, C ₁ -C ₆ haloalkyl, C ₃ -C ₆ cycloalkyl, C ₃ -C ₆ halocycloalkyl, C ₁ -C ₆ alkoxy C ₁ -C ₆ alkyl, C ₁ -C ₆ haloalkoxy C ₁ -C ₆ alkyl, adamantyl, C ₁ -C ₆ aminoalkyl, C ₁ -C ₆ alkylamino C ₁ -C ₆ alkyl, C ₁ -C ₆ dialkylamino C ₁ -C ₆ alkyl, C ₁ -C ₆ haloalkylamino C ₁ -C ₆ alkyl, di (C ₁ -C ₆ haloalkyl) amino C ₁ -C ₆ alkyl, Unsubstituted or substituted phenyl, naphthyl or biphenylyl, Substituted phenyl, naphthyl or biphenylyl, wherein at least one CH group is substituted by N and at least two adjacent CH groups are substituted by S, NH or O, Unsubstituted or substituted phenyl C ₁ -C ₆ alkyl, naphthyl C ₁ -C ₆ alkyl or biphenylyl C ₁ -C ₆ alkyl, Substituted phenyl C ₁ -C ₆ alkyl, naphthyl C ₁ -C ₆ alkyl, or biphenylyl C ₁ -C ₆ alkyl, wherein at least one CH group is substituted by N, and at least two adjacent CH groups are S, Substituted by NH or O), C ₂ -C ₆ alkenyl or C ₂ -C ₆ alkynyl; X is CR ₃₂ ; R ₃₁ and R ₃₂ are independently selected from the group consisting of halogen, hydrogen, CN, C ₁ -C ₃ alkyl and NO ₂ ; R ₃₃ is selected from the group consisting of halogen, C ₁ -C ₆ haloalkyl, C ₁ -C ₆ haloalkoxy, —S (O) _r CF ₃ and -SF ₅ ; R ₃₄ is hydrogen, r is selected from the group consisting of 0, 1 and 2; n is selected from the group consisting of 0, 1 and 2; M is selected from the group consisting of 1 and 2 when R ₂₁ is cyano and m is selected from the group consisting of 0, 1 and 2 when R ₂₁ is not cyano; The term "substituted" as used for R ₂₅ is halogen, nitro, cyano, di- (C ₁ -C ₄ ) alkylamino, (C ₁ -C ₄ ) alkyl, (C ₃ -C ₈ ) cyclo Alkyl, (C ₁ -C ₄ ) trialkylsilyl, (C ₁ -C ₄ ) alkoxy, (C ₁ -C ₄ ) alkoxy- (C ₁ -C ₄ ) alkyl, (C ₁ -C ₂ ) alkoxy- [ CH ₂ CH ₂ O] _0,1,2 -ethoxy, (C ₁ -C ₄ ) alkylthio, (C ₁ -C ₄ ) alkylsulfinyl, (C ₁ -C ₄ ) alkylsulfonyl, phenyl, benzyl , Phenoxy, halophenoxy, (C ₁ -C ₄ ) alkylphenoxy, (C ₁ -C ₄ ) alkoxyphenoxy, phenylthio, Phenyl, naphthyl or biphenylyl, wherein at least one CH group is substituted by N and at least two adjacent CH groups are substituted by S, NH or O, (C ₃ -C ₈ ) cycloalkyl, wherein one or more carbon units are substituted by O, S or NR ′ groups, and R ′ is hydrogen, (C ₁ -C ₄ ) alkyl, (C ₁ -C ₄ ) Alkanoyl, (C ₁ -C ₄ ) alkoxycarbonyl, (C ₁ -C ₄ ) alkylsulfonyl, (C ₁ -C ₄ ) alkoxy, phenyl, naphthyl or biphenylyl), Phenylthio, naphthylthio or biphenylylthio, wherein at least one CH group is substituted by N and at least two adjacent CH groups are substituted by S, NH or O, (C ₃ -C ₈ ) cycloalkylthio wherein at least one carbon unit is substituted by an O, S or NR ′ group, R ′ is hydrogen, (C ₁ -C ₄ ) alkyl, (C ₁ -C ₄ ) Alkanoyl, (C ₁ -C ₄ ) alkoxycarbonyl, (C ₁ -C ₄ ) alkylsulfonyl, (C ₁ -C ₄ ) alkoxy, phenyl, naphthyl or biphenylyl), Phenyloxy, naphthyloxy or biphenylyloxy, wherein at least one CH group is substituted by N and at least two adjacent CH groups are substituted by S, NH or O, or (C ₃ -C ₈ ) cycloalkyloxy, wherein at least one carbon unit is substituted by an O, S or NR ′ group, and R ′ is hydrogen, (C ₁ -C ₄ ) alkyl, (C ₁ -C ₄ ) Alkanoyl, (C ₁ -C ₄ ) alkoxycarbonyl, (C ₁ -C ₄ ) alkylsulfonyl, (C ₁ -C ₄ ) alkoxy, phenyl, naphthyl or biphenylyl) ; Provided that when R ₂₁ is cyano R ₂₄ is not R ₂₅ R ₂₅ -NC (O) -O-. The method of claim 11, A compound of formula II or a veterinary acceptable salt thereof: Formula II

Where R ₂₁ is cyano, C (= S) NH ₂ , C (= NOH) NH ₂ or C (= NNH ₂ ) NH ₂ ; R ₂₂ is S (O) _m R ₂₃ ; R ₂₃ is C ₁ -C ₆ alkyl or C ₁ -C ₆ haloalkyl; R ₂₄ is -OH, HC (O) O-, R ₂₅ C (O) O-, R ₂₅ OC (O) O-, R ₂₅ R ₂₅ NC (O) -O- or R ₂₅ S (O) _n C (O) O—; R ₂₅ is C ₁ -C ₆ alkyl, C ₁ -C ₆ haloalkyl, C ₃ -C ₆ cycloalkyl, C ₃ -C ₆ halocycloalkyl, C ₁ -C ₆ alkoxy C ₁ -C ₆ alkyl, C ₁ -C ₆ haloalkoxy C ₁ -C ₆ alkyl, adamantyl, C ₁ -C ₆ aminoalkyl, C ₁ -C ₆ alkylamino C ₁ -C ₆ alkyl, C ₁ -C ₆ dialkylamino C ₁ -C ₆ alkyl, C ₁ -C ₆ haloalkylamino C ₁ -C ₆ alkyl, di (C ₁ -C ₆ haloalkyl) amino C ₁ -C ₆ alkyl, Unsubstituted or substituted phenyl, naphthyl or biphenylyl, Substituted phenyl, naphthyl or biphenylyl, wherein at least one CH group is substituted by N and at least two adjacent CH groups are substituted by S, NH or O, Unsubstituted or substituted phenyl C ₁ -C ₆ alkyl, naphthyl C ₁ -C ₆ alkyl or biphenylyl C ₁ -C ₆ alkyl, Substituted phenyl C ₁ -C ₆ alkyl, naphthyl C ₁ -C ₆ alkyl, or biphenylyl C ₁ -C ₆ alkyl, wherein at least one CH group is substituted by N, and at least two adjacent CH groups are S, Substituted by NH or O), C ₂ -C ₆ alkenyl or C ₂ -C ₆ alkynyl; X is CR ₃₂ ; R ₃₁ and R ₃₂ are independently selected from the group consisting of halogen, hydrogen, CN, C ₁ -C ₃ alkyl and NO ₂ ; R ₃₃ is selected from the group consisting of halogen, C ₁ -C ₆ haloalkyl, C ₁ -C ₆ haloalkoxy, —S (O) _r CF ₃ and -SF ₅ ; R ₃₄ is hydrogen; m is selected from the group consisting of 1 and 2; r is selected from the group consisting of 0, 1 and 2; n is selected from the group consisting of 0, 1 and 2; The term "substituted" as used for R ₂₅ is halogen, nitro, cyano, di- (C ₁ -C ₄ ) alkylamino, (C ₁ -C ₄ ) alkyl, (C ₃ -C ₈ ) cyclo Alkyl, (C ₁ -C ₄ ) trialkylsilyl, (C ₁ -C ₄ ) alkoxy, (C ₁ -C ₄ ) alkoxy- (C ₁ -C ₄ ) alkyl, (C ₁ -C ₂ ) alkoxy- [ CH ₂ CH ₂ O] _0,1,2 -ethoxy, (C ₁ -C ₄ ) alkylthio, (C ₁ -C ₄ ) alkylsulfinyl, (C ₁ -C ₄ ) alkylsulfonyl, phenyl, benzyl , Phenoxy, halophenoxy, (C ₁ -C ₄ ) alkylphenoxy, (C ₁ -C ₄ ) alkoxyphenoxy, phenylthio, Phenyl, naphthyl or biphenylyl, wherein at least one CH group is substituted by N and at least two adjacent CH groups are substituted by S, NH or O, (C ₃ -C ₈ ) cycloalkyl, wherein one or more carbon units are substituted by O, S or NR ′ groups, and R ′ is hydrogen, (C ₁ -C ₄ ) alkyl, (C ₁ -C ₄ ) Alkanoyl, (C ₁ -C ₄ ) alkoxycarbonyl, (C ₁ -C ₄ ) alkylsulfonyl, (C ₁ -C ₄ ) alkoxy, phenyl, naphthyl or biphenylyl), Phenylthio, naphthylthio or biphenylylthio, wherein at least one CH group is substituted by N and at least two adjacent CH groups are substituted by S, NH or O, (C ₃ -C ₈ ) cycloalkylthio wherein at least one carbon unit is substituted by an O, S or NR ′ group, R ′ is hydrogen, (C ₁ -C ₄ ) alkyl, (C ₁ -C ₄ ) Alkanoyl, (C ₁ -C ₄ ) alkoxycarbonyl, (C ₁ -C ₄ ) alkylsulfonyl, (C ₁ -C ₄ ) alkoxy, phenyl, naphthyl or biphenylyl), Phenyloxy, naphthyloxy or biphenylyloxy, wherein at least one CH group is substituted by N and at least two adjacent CH groups are substituted by S, NH or O, or (C ₃ -C ₈ ) cycloalkyloxy, wherein at least one carbon unit is substituted by an O, S or NR ′ group, and R ′ is hydrogen, (C ₁ -C ₄ ) alkyl, (C ₁ -C ₄ ) Alkanoyl, (C ₁ -C ₄ ) alkoxycarbonyl, (C ₁ -C ₄ ) alkylsulfonyl, (C ₁ -C ₄ ) alkoxy, phenyl, naphthyl or biphenylyl) ; Provided that when R ₂₁ is cyano R ₂₄ is not R ₂₅ R ₂₅ -NC (O) -O-. The method of claim 14, A compound of formula II or a veterinary acceptable salt thereof: Formula II

Where R ₂₁ is cyano; R ₂₂ is S (O) _m R ₂₃ ; R ₂₃ is C ₁ -C ₆ alkyl or C ₁ -C ₆ haloalkyl; R ₂₄ is OH, HC (O) O—, R ₂₅ C (O) O—, R ₂₅ OC (O) O— or R ₂₅ S (O) _n C (O) O—; R ₂₅ is C ₁ -C ₆ alkyl, C ₁ -C ₆ haloalkyl, C ₃ -C ₆ cycloalkyl, C ₃ -C ₆ halocycloalkyl, C ₁ -C ₆ alkoxy C ₁ -C ₆ alkyl, C ₁ -C ₆ haloalkoxy C ₁ -C ₆ alkyl, adamantyl, C ₁ -C ₆ aminoalkyl, C ₁ -C ₆ alkylamino C ₁ -C ₆ alkyl, C ₁ -C ₆ dialkylamino C ₁ -C ₆ alkyl, C ₁ -C ₆ haloalkylamino C ₁ -C ₆ alkyl, di (C ₁ -C ₆ haloalkyl) amino C ₁ -C ₆ alkyl, Unsubstituted or substituted phenyl, naphthyl or biphenylyl, Substituted phenyl, naphthyl or biphenylyl, wherein at least one CH group is substituted by N and at least two adjacent CH groups are substituted by S, NH or O, Unsubstituted or substituted phenyl C ₁ -C ₆ alkyl, naphthyl C ₁ -C ₆ alkyl or biphenylyl C ₁ -C ₆ alkyl, Substituted phenyl C ₁ -C ₆ alkyl, naphthyl C ₁ -C ₆ alkyl, or biphenylyl C ₁ -C ₆ alkyl, wherein at least one CH group is substituted by N, and at least two adjacent CH groups are S, Substituted by NH or O), C ₂ -C ₆ alkenyl or C ₂ -C ₆ alkynyl; X is CR ₃₂ ; R ₃₁ and R ₃₂ are independently selected from the group consisting of halogen, hydrogen, CN, C ₁ -C ₃ alkyl and NO ₂ ; R ₃₃ is selected from the group consisting of halogen, C ₁ -C ₆ haloalkyl, C ₁ -C ₆ haloalkoxy, —S (O) _r CF ₃ and -SF ₅ ; R ₃₄ is hydrogen; m is selected from the group consisting of 1 and 2; r is selected from the group consisting of 0, 1 and 2; n is selected from the group consisting of 0, 1 and 2; The term "substituted" as used for R ₂₅ is halogen, nitro, cyano, di- (C ₁ -C ₄ ) alkylamino, (C ₁ -C ₄ ) alkyl, (C ₃ -C ₈ ) cyclo Alkyl, (C ₁ -C ₄ ) trialkylsilyl, (C ₁ -C ₄ ) alkoxy, (C ₁ -C ₄ ) alkoxy- (C ₁ -C ₄ ) alkyl, (C ₁ -C ₂ ) alkoxy- [ CH ₂ CH ₂ O] _0,1,2 -ethoxy, (C ₁ -C ₄ ) alkylthio, (C ₁ -C ₄ ) alkylsulfinyl, (C ₁ -C ₄ ) alkylsulfonyl, phenyl, benzyl , Phenoxy, halophenoxy, (C ₁ -C ₄ ) alkylphenoxy, (C ₁ -C ₄ ) alkoxyphenoxy, phenylthio, Phenyl, naphthyl or biphenylyl, wherein at least one CH group is substituted by N and at least two adjacent CH groups are substituted by S, NH or O, (C ₃ -C ₈ ) cycloalkyl, wherein one or more carbon units are substituted by O, S or NR ′ groups, and R ′ is hydrogen, (C ₁ -C ₄ ) alkyl, (C ₁ -C ₄ ) Alkanoyl, (C ₁ -C ₄ ) alkoxycarbonyl, (C ₁ -C ₄ ) alkylsulfonyl, (C ₁ -C ₄ ) alkoxy, phenyl, naphthyl or biphenylyl), Phenylthio, naphthylthio or biphenylylthio, wherein at least one CH group is substituted by N and at least two adjacent CH groups are substituted by S, NH or O, (C ₃ -C ₈ ) cycloalkylthio wherein at least one carbon unit is substituted by an O, S or NR ′ group, R ′ is hydrogen, (C ₁ -C ₄ ) alkyl, (C ₁ -C ₄ ) Alkanoyl, (C ₁ -C ₄ ) alkoxycarbonyl, (C ₁ -C ₄ ) alkylsulfonyl, (C ₁ -C ₄ ) alkoxy, phenyl, naphthyl or biphenylyl), Phenyloxy, naphthyloxy or biphenylyloxy, wherein at least one CH group is substituted by N and at least two adjacent CH groups are substituted by S, NH or O, or (C ₃ -C ₈ ) cycloalkyloxy, wherein at least one carbon unit is substituted by an O, S or NR ′ group, and R ′ is hydrogen, (C ₁ -C ₄ ) alkyl, (C ₁ -C ₄ ) Alkanoyl, (C ₁ -C ₄ ) alkoxycarbonyl, (C ₁ -C ₄ ) alkylsulfonyl, (C ₁ -C ₄ ) alkoxy, phenyl, naphthyl or biphenylyl). . The method of claim 15, A compound of formula II or a veterinary acceptable salt thereof: Formula II

Where R ₂₁ is C (= S) NH ₂ , C (= NOH) NH ₂ or C (= NNH ₂ ) NH ₂ ; R ₂₂ is S (O) _m R ₂₃ ; R ₂₃ is C ₁ -C ₆ alkyl or C ₁ -C ₆ haloalkyl; R ₂₄ is OH, HC (O) O-, R ₂₅ C (O) O-, R ₂₅ OC (O) O-, R ₂₅ R ₂₅ -NC (O) -O- or R ₂₅ S (O) _n C (O) O—; R ₂₅ is C ₁ -C ₆ alkyl, C ₁ -C ₆ haloalkyl, C ₃ -C ₆ cycloalkyl, C ₃ -C ₆ halocycloalkyl, C ₁ -C ₆ alkoxy C ₁ -C ₆ alkyl, C ₁ -C ₆ haloalkoxy C ₁ -C ₆ alkyl, adamantyl, C ₁ -C ₆ aminoalkyl, C ₁ -C ₆ alkylamino C ₁ -C ₆ alkyl, C ₁ -C ₆ dialkylamino C ₁ -C ₆ alkyl, C ₁ -C ₆ haloalkylamino C ₁ -C ₆ alkyl, di (C ₁ -C ₆ haloalkyl) amino C ₁ -C ₆ alkyl, Unsubstituted or substituted phenyl, naphthyl or biphenylyl, Substituted phenyl, naphthyl or biphenylyl, wherein at least one CH group is substituted by N and at least two adjacent CH groups are substituted by S, NH or O, Unsubstituted or substituted phenyl C ₁ -C ₆ alkyl, naphthyl C ₁ -C ₆ alkyl or biphenylyl C ₁ -C ₆ alkyl, substituted phenyl C ₁ -C ₆ alkyl, naphthyl C ₁ -C ₆ alkyl Or biphenylyl C ₁ -C ₆ alkyl, wherein at least one CH group is substituted by N and at least two adjacent CH groups are substituted by S, NH or O, C ₂ -C ₆ alkenyl or C ₂ -C ₆ alkynyl; X is CR ₃₂ ; R ₃₁ and R ₃₂ are independently selected from the group consisting of halogen, hydrogen, CN, C ₁ -C ₃ alkyl and NO ₂ ; R ₃₃ is selected from the group consisting of halogen, C ₁ -C ₆ haloalkyl, C ₁ -C ₆ haloalkoxy, —S (O) _r CF ₃ and -SF ₅ ; R ₃₄ is hydrogen; m is selected from the group consisting of 0, 1 and 2; r is selected from the group consisting of 0, 1 and 2; n is selected from the group consisting of 0, 1 and 2; The term "substituted" as used for R ₂₅ is halogen, nitro, cyano, di- (C ₁ -C ₄ ) alkylamino, (C ₁ -C ₄ ) alkyl, (C ₃ -C ₈ ) cyclo Alkyl, (C ₁ -C ₄ ) trialkylsilyl, (C ₁ -C ₄ ) alkoxy, (C ₁ -C ₄ ) alkoxy- (C ₁ -C ₄ ) alkyl, (C ₁ -C ₂ ) alkoxy- [ CH ₂ CH ₂ O] _0,1,2 -ethoxy, (C ₁ -C ₄ ) alkylthio, (C ₁ -C ₄ ) alkylsulfinyl, (C ₁ -C ₄ ) alkylsulfonyl, phenyl, benzyl , Phenoxy, halophenoxy, (C ₁ -C ₄ ) alkylphenoxy, (C ₁ -C ₄ ) alkoxyphenoxy, phenylthio, Phenyl, naphthyl or biphenylyl, wherein at least one CH group is substituted by N and at least two adjacent CH groups are substituted by S, NH or O, (C ₃ -C ₈ ) cycloalkyl, wherein one or more carbon units are substituted by O, S or NR ′ groups, and R ′ is hydrogen, (C ₁ -C ₄ ) alkyl, (C ₁ -C ₄ ) Alkanoyl, (C ₁ -C ₄ ) alkoxycarbonyl, (C ₁ -C ₄ ) alkylsulfonyl, (C ₁ -C ₄ ) alkoxy, phenyl, naphthyl or biphenylyl), Phenylthio, naphthylthio or biphenylylthio, wherein at least one CH group is substituted by N and at least two adjacent CH groups are substituted by S, NH or O, (C ₃ -C ₈ ) cycloalkylthio wherein at least one carbon unit is substituted by an O, S or NR ′ group, R ′ is hydrogen, (C ₁ -C ₄ ) alkyl, (C ₁ -C ₄ ) Alkanoyl, (C ₁ -C ₄ ) alkoxycarbonyl, (C ₁ -C ₄ ) alkylsulfonyl, (C ₁ -C ₄ ) alkoxy, phenyl, naphthyl or biphenylyl), Phenyloxy, naphthyloxy or biphenylyloxy, wherein at least one CH group is substituted by N and at least two adjacent CH groups are substituted by S, NH or O, or (C ₃ -C ₈ ) cycloalkyloxy, wherein at least one carbon unit is substituted by an O, S or NR ′ group, and R ′ is hydrogen, (C ₁ -C ₄ ) alkyl, (C ₁ -C ₄ ) Alkanoyl, (C ₁ -C ₄ ) alkoxycarbonyl, (C ₁ -C ₄ ) alkylsulfonyl, (C ₁ -C ₄ ) alkoxy, phenyl, naphthyl or biphenylyl). . The method of claim 3, wherein A compound of formula II or a veterinary acceptable salt thereof: Formula II

Where R ₂₁ is cyano, C (= S) NH ₂ , C (= NOH) NH ₂ or C (= NNH ₂ ) NH ₂ ; R ₂₂ is S (O) _m R ₂₃ ; R ₂₃ is C ₁ -C ₆ alkyl or C ₁ -C ₆ haloalkyl; R ₂₄ is OH; R ₂₅ is C ₁ -C ₆ alkyl, C ₁ -C ₆ haloalkyl, C ₃ -C ₆ cycloalkyl, C ₃ -C ₆ halocycloalkyl, C ₁ -C ₆ alkoxy C ₁ -C ₆ alkyl, C ₁ -C ₆ haloalkoxy C ₁ -C ₆ alkyl, adamantyl, C ₁ -C ₆ aminoalkyl, C ₁ -C ₆ alkylamino C ₁ -C ₆ alkyl, C ₁ -C ₆ dialkylamino C ₁ -C ₆ alkyl, C ₁ -C ₆ haloalkylamino C ₁ -C ₆ alkyl, di (C ₁ -C ₆ haloalkyl) amino C ₁ -C ₆ alkyl, Unsubstituted or substituted phenyl, naphthyl or biphenylyl, Substituted phenyl, naphthyl or biphenylyl, wherein at least one CH group is substituted by N and at least two adjacent CH groups are substituted by S, NH or O, Unsubstituted or substituted phenyl C ₁ -C ₆ alkyl, naphthyl C ₁ -C ₆ alkyl or biphenylyl C ₁ -C ₆ alkyl, substituted phenyl C ₁ -C ₆ alkyl, naphthyl C ₁ -C ₆ alkyl Or biphenylyl C ₁ -C ₆ alkyl, wherein at least one CH group is substituted by N and at least two adjacent CH groups are substituted by S, NH or O, C ₂ -C ₆ alkenyl or C ₂ -C ₆ alkynyl; X is CR ₃₂ ; R ₃₁ and R ₃₂ are independently selected from the group consisting of halogen, hydrogen, CN, C ₁ -C ₃ alkyl and NO ₂ ; R ₃₃ is selected from the group consisting of halogen, C ₁ -C ₆ haloalkyl, C ₁ -C ₆ haloalkoxy, —S (O) _r CF ₃ and -SF ₅ ; R ₃₄ is hydrogen; r is selected from the group consisting of 0, 1 and 2; M is selected from the group consisting of 1 and 2 when R ₂₁ is cyano and m is selected from the group consisting of 0, 1 and 2 when R ₂₁ is not cyano; The term "substituted" as used for R ₂₅ is halogen, nitro, cyano, di- (C ₁ -C ₄ ) alkylamino, (C ₁ -C ₄ ) alkyl, (C ₃ -C ₈ ) cyclo Alkyl, (C ₁ -C ₄ ) trialkylsilyl, (C ₁ -C ₄ ) alkoxy, (C ₁ -C ₄ ) alkoxy- (C ₁ -C ₄ ) alkyl, (C ₁ -C ₂ ) alkoxy- [ CH ₂ CH ₂ O] _0,1,2 -ethoxy, (C ₁ -C ₄ ) alkylthio, (C ₁ -C ₄ ) alkylsulfinyl, (C ₁ -C ₄ ) alkylsulfonyl, phenyl, benzyl , Phenoxy, halophenoxy, (C ₁ -C ₄ ) alkylphenoxy, (C ₁ -C ₄ ) alkoxyphenoxy, phenylthio, Phenyl, naphthyl or biphenylyl, wherein at least one CH group is substituted by N and at least two adjacent CH groups are substituted by S, NH or O, (C ₃ -C ₈ ) cycloalkyl, wherein one or more carbon units are substituted by O, S or NR ′ groups, and R ′ is hydrogen, (C ₁ -C ₄ ) alkyl, (C ₁ -C ₄ ) Alkanoyl, (C ₁ -C ₄ ) alkoxycarbonyl, (C ₁ -C ₄ ) alkylsulfonyl, (C ₁ -C ₄ ) alkoxy, phenyl, naphthyl or biphenylyl), Phenylthio, naphthylthio or biphenylylthio, wherein at least one CH group is substituted by N and at least two adjacent CH groups are substituted by S, NH or O, (C ₃ -C ₈ ) cycloalkylthio wherein at least one carbon unit is substituted by an O, S or NR ′ group, R ′ is hydrogen, (C ₁ -C ₄ ) alkyl, (C ₁ -C ₄ ) Alkanoyl, (C ₁ -C ₄ ) alkoxycarbonyl, (C ₁ -C ₄ ) alkylsulfonyl, (C ₁ -C ₄ ) alkoxy, phenyl, naphthyl or biphenylyl), Phenyloxy, naphthyloxy or biphenylyloxy, wherein at least one CH group is substituted by N and at least two adjacent CH groups are substituted by S, NH or O, or (C ₃ -C ₈ ) cycloalkyloxy, wherein at least one carbon unit is substituted by an O, S or NR ′ group, and R ′ is hydrogen, (C ₁ -C ₄ ) alkyl, (C ₁ -C ₄ ) Alkanoyl, (C ₁ -C ₄ ) alkoxycarbonyl, (C ₁ -C ₄ ) alkylsulfonyl, (C ₁ -C ₄ ) alkoxy, phenyl, naphthyl or biphenylyl). . The method of claim 11, A compound of formula II or a veterinary acceptable salt thereof: Formula II

Where R ₂₁ is cyano, C (= S) NH ₂ , C (= NOH) NH ₂ or C (= NNH ₂ ) NH ₂ ; R ₂₂ is S (O) _m R ₂₃ ; R ₂₃ is C ₁ -C ₆ alkyl or C ₁ -C ₆ haloalkyl; R ₂₄ is -OH; R ₂₅ is C ₁ -C ₆ alkyl, C ₁ -C ₆ haloalkyl, C ₃ -C ₆ cycloalkyl, C ₃ -C ₆ halocycloalkyl, C ₁ -C ₆ alkoxy C ₁ -C ₆ alkyl, C ₁ -C ₆ haloalkoxy C ₁ -C ₆ alkyl, adamantyl, C ₁ -C ₆ aminoalkyl, C ₁ -C ₆ alkylamino C ₁ -C ₆ alkyl, C ₁ -C ₆ dialkylamino C ₁ -C ₆ alkyl, C ₁ -C ₆ haloalkylamino C ₁ -C ₆ alkyl, di (C ₁ -C ₆ haloalkyl) amino C ₁ -C ₆ alkyl, Unsubstituted or substituted phenyl, naphthyl or biphenylyl, Substituted phenyl, naphthyl or biphenylyl, wherein at least one CH group is substituted by N and at least two adjacent CH groups are substituted by S, NH or O, Unsubstituted or substituted phenyl C ₁ -C ₆ alkyl, naphthyl C ₁ -C ₆ alkyl or biphenylyl C ₁ -C ₆ alkyl, substituted phenyl C ₁ -C ₆ alkyl, naphthyl C ₁ -C ₆ alkyl Or biphenylyl C ₁ -C ₆ alkyl, wherein at least one CH group is substituted by N and at least two adjacent CH groups are substituted by S, NH or O, C ₂ -C ₆ alkenyl or C ₂ -C ₆ alkynyl; X is CR ₃₂ ; R ₃₁ and R ₃₂ are independently selected from the group consisting of halogen, hydrogen, CN, C ₁ -C ₃ alkyl and NO ₂ ; R ₃₃ is selected from the group consisting of halogen, C ₁ -C ₆ haloalkyl, C ₁ -C ₆ haloalkoxy, —S (O) _r CF ₃ and -SF ₅ ; R ₃₄ is hydrogen; m is selected from the group consisting of 1 and 2; r is selected from the group consisting of 0, 1 and 2; The term "substituted" as used for R ₂₅ is halogen, nitro, cyano, di- (C ₁ -C ₄ ) alkylamino, (C ₁ -C ₄ ) alkyl, (C ₃ -C ₈ ) cyclo Alkyl, (C ₁ -C ₄ ) trialkylsilyl, (C ₁ -C ₄ ) alkoxy, (C ₁ -C ₄ ) alkoxy- (C ₁ -C ₄ ) alkyl, (C ₁ -C ₂ ) alkoxy- [ CH ₂ CH ₂ O] _0,1,2 -ethoxy, (C ₁ -C ₄ ) alkylthio, (C ₁ -C ₄ ) alkylsulfinyl, (C ₁ -C ₄ ) alkylsulfonyl, phenyl, benzyl , Phenoxy, halophenoxy, (C ₁ -C ₄ ) alkylphenoxy, (C ₁ -C ₄ ) alkoxyphenoxy, phenylthio, Phenyl, naphthyl or biphenylyl, wherein at least one CH group is substituted by N and at least two adjacent CH groups are substituted by S, NH or O, (C ₃ -C ₈ ) cycloalkyl, wherein one or more carbon units are substituted by O, S or NR ′ groups, and R ′ is hydrogen, (C ₁ -C ₄ ) alkyl, (C ₁ -C ₄ ) Alkanoyl, (C ₁ -C ₄ ) alkoxycarbonyl, (C ₁ -C ₄ ) alkylsulfonyl, (C ₁ -C ₄ ) alkoxy, phenyl, naphthyl or biphenylyl), Phenylthio, naphthylthio or biphenylylthio, wherein at least one CH group is substituted by N and at least two adjacent CH groups are substituted by S, NH or O, (C ₃ -C ₈ ) cycloalkylthio wherein at least one carbon unit is substituted by an O, S or NR ′ group, R ′ is hydrogen, (C ₁ -C ₄ ) alkyl, (C ₁ -C ₄ ) Alkanoyl, (C ₁ -C ₄ ) alkoxycarbonyl, (C ₁ -C ₄ ) alkylsulfonyl, (C ₁ -C ₄ ) alkoxy, phenyl, naphthyl or biphenylyl), Phenyloxy, naphthyloxy or biphenylyloxy, wherein at least one CH group is substituted by N and at least two adjacent CH groups are substituted by S, NH or O, or (C ₃ -C ₈ ) cycloalkyloxy, wherein at least one carbon unit is substituted by an O, S or NR ′ group, and R ′ is hydrogen, (C ₁ -C ₄ ) alkyl, (C ₁ -C ₄ ) Alkanoyl, (C ₁ -C ₄ ) alkoxycarbonyl, (C ₁ -C ₄ ) alkylsulfonyl, (C ₁ -C ₄ ) alkoxy, phenyl, naphthyl or biphenylyl). . The method of claim 14, A compound of formula II or a veterinary acceptable salt thereof: Formula II

Where R ₂₁ is cyano; R ₂₂ is S (O) _m R ₂₃ ; R ₂₃ is C ₁ -C ₆ alkyl or C ₁ -C ₆ haloalkyl; R ₂₄ is OH; R ₂₅ is C ₁ -C ₆ alkyl, C ₁ -C ₆ haloalkyl, C ₃ -C ₆ cycloalkyl, C ₃ -C ₆ halocycloalkyl, C ₁ -C ₆ alkoxy C ₁ -C ₆ alkyl, C ₁ -C ₆ haloalkoxy C ₁ -C ₆ alkyl, adamantyl, C ₁ -C ₆ aminoalkyl, C ₁ -C ₆ alkylamino C ₁ -C ₆ alkyl, C ₁ -C ₆ dialkylamino C ₁ -C ₆ alkyl, C ₁ -C ₆ haloalkylamino C ₁ -C ₆ alkyl, di (C ₁ -C ₆ haloalkyl) amino C ₁ -C ₆ alkyl, Unsubstituted or substituted phenyl, naphthyl or biphenylyl, Substituted phenyl, naphthyl or biphenylyl, wherein at least one CH group is substituted by N and at least two adjacent CH groups are substituted by S, NH or O, Unsubstituted or substituted phenyl C ₁ -C ₆ alkyl, naphthyl C ₁ -C ₆ alkyl or biphenylyl C ₁ -C ₆ alkyl, Substituted phenyl C ₁ -C ₆ alkyl, naphthyl C ₁ -C ₆ alkyl, or biphenylyl C ₁ -C ₆ alkyl, wherein at least one CH group is substituted by N, and at least two adjacent CH groups are S, Substituted by NH or O), C ₂ -C ₆ alkenyl or C ₂ -C ₆ alkynyl; X is CR ₃₂ ; R ₃₁ and R ₃₂ are independently selected from the group consisting of halogen, hydrogen, CN, C ₁ -C ₃ alkyl and NO ₂ ; R ₃₃ is selected from the group consisting of halogen, C ₁ -C ₆ haloalkyl, C ₁ -C ₆ haloalkoxy, —S (O) _r CF ₃ and -SF ₅ ; R ₃₄ is hydrogen; m is selected from the group consisting of 1 and 2; r is selected from the group consisting of 0, 1 and 2; The term "substituted" as used for R ₂₅ is halogen, nitro, cyano, di- (C ₁ -C ₄ ) alkylamino, (C ₁ -C ₄ ) alkyl, (C ₃ -C ₈ ) cyclo Alkyl, (C ₁ -C ₄ ) trialkylsilyl, (C ₁ -C ₄ ) alkoxy, (C ₁ -C ₄ ) alkoxy- (C ₁ -C ₄ ) alkyl, (C ₁ -C ₂ ) alkoxy- [ CH ₂ CH ₂ O] _0,1,2 -ethoxy, (C ₁ -C ₄ ) alkylthio, (C ₁ -C ₄ ) alkylsulfinyl, (C ₁ -C ₄ ) alkylsulfonyl, phenyl, benzyl , Phenoxy, halophenoxy, (C ₁ -C ₄ ) alkylphenoxy, (C ₁ -C ₄ ) alkoxyphenoxy, phenylthio, Phenyl, naphthyl or biphenylyl, wherein at least one CH group is substituted by N and at least two adjacent CH groups are substituted by S, NH or O, (C ₃ -C ₈ ) cycloalkyl, wherein one or more carbon units are substituted by O, S or NR ′ groups, and R ′ is hydrogen, (C ₁ -C ₄ ) alkyl, (C ₁ -C ₄ ) Alkanoyl, (C ₁ -C ₄ ) alkoxycarbonyl, (C ₁ -C ₄ ) alkylsulfonyl, (C ₁ -C ₄ ) alkoxy, phenyl, naphthyl or biphenylyl), Phenylthio, naphthylthio or biphenylylthio, wherein at least one CH group is substituted by N and at least two adjacent CH groups are substituted by S, NH or O, (C ₃ -C ₈ ) cycloalkylthio wherein at least one carbon unit is substituted by an O, S or NR ′ group, R ′ is hydrogen, (C ₁ -C ₄ ) alkyl, (C ₁ -C ₄ ) Alkanoyl, (C ₁ -C ₄ ) alkoxycarbonyl, (C ₁ -C ₄ ) alkylsulfonyl, (C ₁ -C ₄ ) alkoxy, phenyl, naphthyl or biphenylyl), Phenyloxy, naphthyloxy or biphenylyloxy, wherein at least one CH group is substituted by N and at least two adjacent CH groups are substituted by S, NH or O, or (C ₃ -C ₈ ) cycloalkyloxy, wherein at least one carbon unit is substituted by an O, S or NR ′ group, and R ′ is hydrogen, (C ₁ -C ₄ ) alkyl, (C ₁ -C ₄ ) Alkanoyl, (C ₁ -C ₄ ) alkoxycarbonyl, (C ₁ -C ₄ ) alkylsulfonyl, (C ₁ -C ₄ ) alkoxy, phenyl, naphthyl or biphenylyl). . The method of claim 15, A compound of formula II or a veterinary acceptable salt thereof: Formula II

Where R ₂₁ is C (= S) NH ₂ , C (= NOH) NH ₂ or C (= NNH ₂ ) NH ₂ ; R ₂₂ is S (O) _m R ₂₃ ; R ₂₃ is C ₁ -C ₆ alkyl or C ₁ -C ₆ haloalkyl; R ₂₄ is OH; R ₂₅ is C ₁ -C ₆ alkyl, C ₁ -C ₆ haloalkyl, C ₃ -C ₆ cycloalkyl, C ₃ -C ₆ halocycloalkyl, C ₁ -C ₆ alkoxy C ₁ -C ₆ alkyl, C ₁ -C ₆ haloalkoxy C ₁ -C ₆ alkyl, adamantyl, C ₁ -C ₆ aminoalkyl, C ₁ -C ₆ alkylamino C ₁ -C ₆ alkyl, C ₁ -C ₆ dialkylamino C ₁ -C ₆ alkyl, C ₁ -C ₆ haloalkylamino C ₁ -C ₆ alkyl, di (C ₁ -C ₆ haloalkyl) amino C ₁ -C ₆ alkyl, Unsubstituted or substituted phenyl, naphthyl or biphenylyl, Substituted phenyl, naphthyl or biphenylyl, wherein at least one CH group is substituted by N and at least two adjacent CH groups are substituted by S, NH or O, Unsubstituted or substituted phenyl C ₁ -C ₆ alkyl, naphthyl C ₁ -C ₆ alkyl or biphenylyl C ₁ -C ₆ alkyl, Substituted phenyl C ₁ -C ₆ alkyl, naphthyl C ₁ -C ₆ alkyl, or biphenylyl C ₁ -C ₆ alkyl, wherein at least one CH group is substituted by N, and at least two adjacent CH groups are S, Substituted by NH or O), C ₂ -C ₆ alkenyl or C ₂ -C ₆ alkynyl; X is CR ₃₂ ; R ₃₁ and R ₃₂ are independently selected from the group consisting of halogen, hydrogen, CN, C ₁ -C ₃ alkyl and NO ₂ ; R ₃₃ is selected from the group consisting of halogen, C ₁ -C ₆ haloalkyl, C ₁ -C ₆ haloalkoxy, —S (O) _r CF ₃ and -SF ₅ ; R ₃₄ is hydrogen; m is selected from the group consisting of 0, 1 and 2; r is selected from the group consisting of 0, 1 and 2; The term "substituted" as used for R ₂₅ is halogen, nitro, cyano, di- (C ₁ -C ₄ ) alkylamino, (C ₁ -C ₄ ) alkyl, (C ₃ -C ₈ ) cyclo Alkyl, (C ₁ -C ₄ ) trialkylsilyl, (C ₁ -C ₄ ) alkoxy, (C ₁ -C ₄ ) alkoxy- (C ₁ -C ₄ ) alkyl, (C ₁ -C ₂ ) alkoxy- [ CH ₂ CH ₂ O] _0,1,2 -ethoxy, (C ₁ -C ₄ ) alkylthio, (C ₁ -C ₄ ) alkylsulfinyl, (C ₁ -C ₄ ) alkylsulfonyl, phenyl, benzyl , Phenoxy, halophenoxy, (C ₁ -C ₄ ) alkylphenoxy, (C ₁ -C ₄ ) alkoxyphenoxy, phenylthio, Phenyl, naphthyl or biphenylyl, wherein at least one CH group is substituted by N and at least two adjacent CH groups are substituted by S, NH or O, (C ₃ -C ₈ ) cycloalkyl, wherein one or more carbon units are substituted by O, S or NR ′ groups, and R ′ is hydrogen, (C ₁ -C ₄ ) alkyl, (C ₁ -C ₄ ) Alkanoyl, (C ₁ -C ₄ ) alkoxycarbonyl, (C ₁ -C ₄ ) alkylsulfonyl, (C ₁ -C ₄ ) alkoxy, phenyl, naphthyl or biphenylyl), Phenylthio, naphthylthio or biphenylylthio, wherein at least one CH group is substituted by N and at least two adjacent CH groups are substituted by S, NH or O, (C ₃ -C ₈ ) cycloalkylthio wherein at least one carbon unit is substituted by an O, S or NR ′ group, R ′ is hydrogen, (C ₁ -C ₄ ) alkyl, (C ₁ -C ₄ ) Alkanoyl, (C ₁ -C ₄ ) alkoxycarbonyl, (C ₁ -C ₄ ) alkylsulfonyl, (C ₁ -C ₄ ) alkoxy, phenyl, naphthyl or biphenylyl), Phenyloxy, naphthyloxy or biphenylyloxy, wherein at least one CH group is substituted by N and at least two adjacent CH groups are substituted by S, NH or O, or (C ₃ -C ₈ ) cycloalkyloxy, wherein at least one carbon unit is substituted by an O, S or NR ′ group, and R ′ is hydrogen, (C ₁ -C ₄ ) alkyl, (C ₁ -C ₄ ) Alkanoyl, (C ₁ -C ₄ ) alkoxycarbonyl, (C ₁ -C ₄ ) alkylsulfonyl, (C ₁ -C ₄ ) alkoxy, phenyl, naphthyl or biphenylyl). .